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    Wyświetlanie 1-41 z 41
    Tytuł:
    Point-Contact Spectroscopy of Superconducting $MgCNi_3$ Single Crystals
    Autorzy:
    Pribulová, Z.
    Szabó, P.
    Kačmarčík, J.
    Samuely, P.
    Jang, D.
    Lee, H.
    Lee, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813611.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    Opis:
    The first point-contact spectroscopy measurements on $MgCNi_3$ single crystals of very good quality are presented. The measurements have been performed in the temperature range from 1.5 K up to 10 K and at magnetic fields up to 6 T. The superconducting energy gap Δ of the system is found to be scattered between 1 and 1.2 meV which gives the 2Δ/k $T_c$ ratio between BCS weak-coupling value of ~3.5 and a strong coupling of about 4.2. The excess current evaluated in magnetic field indicates the presence of a single energy gap.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 215-218
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Microwave Power on Josephson Microwave Absorption in High- Temperature Superconductors
    Autorzy:
    Czyżak, B.
    Stankowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887983.pdf
    Data publikacji:
    1991-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Vy
    Opis:
    The influence of the microwave power on the internal Josephson Junction System (JJS) in granular high T$\text{}_{c}$, superconductors was investigated using EPR methodology. Josephson Microwave Absorption signal was used to monitor local temperature of the Josephson Junction System while the bulk sample temperature was measured by a thermocouple. The effect of the JJS overheating is discussed as the consequence of an interaction between JJS, microwave field and the bulk sample.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 1; 99-106
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and transport characteristics of tunnel junctions with hybrid semiconductor barriers with quantum dots
    Autorzy:
    Shaternik, V.
    Shapovalov, A.
    Prikhna, T.
    Suvorov, O.
    Skorik, M.
    Shaternik, A.
    Bondarchuk, V.
    Zubov, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052840.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.81.-g
    Opis:
    We propose to realize MoRe/SiO_x(W)/MoRe hybrid junctions by using self-organization effects for the creation of quantum dots (tungsten clusters) in the semiconductor barriers consisting of a mixture of silicon and silicon oxide. Current-voltage characteristics of the MoRe/SiO_x(W)/MoRe samples have been measured in a wide voltage range from -900 to 900 mV at temperatures from 4.2 to 77 K. At low temperatures and for a comparatively small W content in the hybrid barrier, the heterostructures exhibited current-voltage curves of an unusual shape. Single or several current peaks caused by electron tunneling through the allowed states in the barrier have been observed in the transport characteristics. With increasing temperature, superconducting fluctuations in the MoRe electrodes become unimportant, and the current-voltage curve of a heterostructure follows the Ohm law. At last, we present theoretical description of the charge transport in such inhomogeneous systems with account of many-electron processes.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1060-1064
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Induced Resonances in Asymmetric Superconducting Quantum Interference Devices
    Autorzy:
    Polak, T.
    Sarnelli, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812325.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.50.+r
    Opis:
    Theory of self-induced resonances in asymmetric two-junction interferometer device is presented. An extension of previous theoretical approaches contains inclusions from several asymmetries: the Josephson current ε, capacitances χand dissipation ρpresented in an equivalent circuit. Our theory can be useful to determine asymmetry parameters always present in lightly damped asymmetric SQUIDs made from low- and high-$T_C$ materials.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 203-207
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point Contact Studies of High T$\text{}_{c}$ Superconductors
    Autorzy:
    Susła, B.
    Meepagala, S. C.
    Wolf, E. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929570.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Tx
    Opis:
    Point contact spectroscopy experiments were performed on both single crystals Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+y}$ and BiSrCaCuO/Ag sintered material using gold tips. The spectra exhibit tunneling structure, which are interpreted in terms of the energy gap structure 2Δ = 58 meV at 4.2 K. We observed the strong Andreev reflection of the Au-BiSrCaCuO/Ag boundary.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 315-319
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stationary Properties of Superconducting Interferometers
    Autorzy:
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892080.pdf
    Data publikacji:
    1991-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    85.25.Dq
    Opis:
    A generalized superconducting interferometer, comprising a parallel arrangement of (lumped) inductances and series (lumped) Josephson junctions is considered. Such a system can be seen as the building block of a simplified model of a high-T$\text{}_{c}$ superconductor with its haphazard distribution of Josephson weak links on grain boundaries and lattice defects. It is shown that the system properties can be self-consistently derived from a properly defined potential energy function, taking account of the energies of the system, its current source and external magnetic field. In particular, by solving a stationary problem for this function relative to conditions of constant current bias and constant magnetic flux applied to the system, the critical current of the interferometer can be determined in function of the applied flux. Stationary phase relations and their impact on other system variables are discussed in detail. The theory is applied to the simplest possible system exhibiting all discussed properties, i.e. an interferometer composed of two junctions in series and one junction in parallel.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 6; 841-856
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropic Microwave Absorption in High-T$\text{}_{c}$ like Semiconductor Superconducting Superlattices (001) PbTe-PbS
    Autorzy:
    Mironov, O. A.
    Makarovskii, O. N.
    Fedorenko, A. I.
    Sipatov, A. Yu.
    Nashchekina, O. N.
    Zaritskii, I. M.
    Konchits, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931192.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    74.50.+r
    Opis:
    The anisotropic microwave absorption in the presence of alternative magnetic field has been studied for the first time in superconducting super-lattices based on PbTe-PbS, which are layered anisotropic systems similar to high T$\text{}_{c}$ superconductors. A new method of study has been used. The microwave response was detected under broad-band conditions and compared with the results of synchronous detection. All the features which have been observed in high T$\text{}_{c}$ materials are clearly seen here.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 603-606
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anomalous Galvanomagnetic Effects in InSb Thin Films with Superconducting Lead Inclusions
    Autorzy:
    Mironov, O. A.
    Nashchekina, O. N.
    Oszwaldowski, M.
    Berus, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928271.pdf
    Data publikacji:
    1993-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    74.50.+r
    Opis:
    We report on the first experimental observations of an anomalous increase in the resistance of a semiconductor-super conductor contact in the vicinity of the critical temperature T$\text{}_{c}$. The effect is found in lead-doped InSb thin films having inclusions of lead of 1-3 μm in diameter: The observed effect can be a model that explains similar resistance increase observed sometimes in the high T$\text{}_{c}$ superconductors.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 2; 227-230
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase-Slip Processes in Superconducting Films: AC Josephson Effect and New Phase Transition
    Autorzy:
    Dmitriev, V.
    Zolochevskii, I.
    Bezuglyi, E.
    Kondrashev, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812339.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Fy
    74.25.Nf
    74.50.+r
    Opis:
    The resistive direct current state in wide thin superconducting films as the phase transition from superconducting to normal state is investigated in the absence of external magnetic field. We showed that the states of a wide film with increasing transport current appear in the following order: the superconducting state; the resistive vortex state; the critical state; the new vortex-free resistive state with phase-slip lines; the normal state. We detected the Shapiro current steps on the current-voltage characteristic of the wide film, which arise due to interaction of intrinsic Josephson radiation of phase-slip lines with external microwave irradiation.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 257-261
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong-Coupling Features in $YB_6$ and $ZrB_{12}$ Studied by Point-Contact Spectroscopy
    Autorzy:
    Girovský, J.
    Szabó, P.
    Mori, T.
    Samuely, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535414.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Ad
    74.62.Dh
    Opis:
    Point-contact spectroscopy studies of the superconducting energy gap and the electron-phonon coupling mechanism are performed on the boron rich $YB_6$ and $ZrB_{12}$ single crystals. The obtained values of the superconducting energy gaps suggest the strong coupling with 2 Δ/$k_{B}T_{c}$≈ 4.2 for $YB_6$ and 2 Δ/$k_{B}T_{c}$≈ 4.15 for $ZrB_{12}$. We have observed the dominant soft phonon modes mediating superconductivity in the both samples at energy ≈ 8 meV for $YB_6$ and ≈ 11 meV in $ZrB_{12}$, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1042-1044
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point Contact Spectroscopy Measurements of $Ba(Fe_{0.96}Co_{0.04})_2As_2$ Single Crystals
    Autorzy:
    Szabó, P.
    Girovský, J.
    Pribulová, Z.
    Samuely, T.
    Bud'ko, S.
    Canfield, P.
    Samuely, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535447.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Ad
    74.62.Dh
    Opis:
    Point contact spectroscopy results are presented on the electron underdoped $Ba(Fe_{0.96}Co_{0.04})_2As_2$ single crystals. Two superconducting energy gaps with coupling values 2 $Δ_1$ ∿ $kT_{c}$ ≈ 2.55 and 2 $Δ_2$ ∿ $kT_{c}$ ≈ 11 at $T_{c}$ = 15.5 K have been observed in the point contact spectra. The temperature dependence of the normal state background of the point contact spectra observed between $T_{c}$ and $T_{N}$ indicates antiferromagnetic origin of the V-shaped minimum at zero bias.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1045-1046
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity Near Transition to Insulating State in MoC Ultrathin Films Studied by Subkelvin STM
    Autorzy:
    Szabó, P.
    Neilinger, P.
    Trgala, M.
    Grajcar, M.
    Samuely, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372334.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.78.-w
    74.81.-g
    Opis:
    We study the homogeneously disordered MoC thin films with thicknesses of 10 and 5 nm and the superconducting transition temperatures near 6 and 4 K, significantly decreased as compared to the bulk $T_{c}$=8.32 K due to a disorder. The scanning tunnelling spectroscopy reveals in the thicker sample a BCS superconducting energy gap Δ with a broadening parameter Γ equal to about 10 per cent of Δ. Remarkably, Γ increases with temperature. The thinner, more disordered sample shows a gapped superconducting density of states but without any coherence peaks at the gap edge, which could not be approximated by the BCS DOS. Moreover, the reduced DOS around the Fermi level persists above the resistive transition temperature reminding the pseudo-gap known from high-$T_{c}$ cuprates.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 368-369
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inter- and Intragrain Magnetization of Thallium-Based Superconductors
    Autorzy:
    Tokarz, W.
    Kąkol, Z.
    Kołodziejczyk, A.
    König, W.
    Gritzner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014492.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Fq
    74.72.-h
    74.50.+r
    Opis:
    We report on magnetization and magnetic hysteresis measurements for the (Tl$\text{}_{0.6}$Bi$\text{}_{0.5}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{y}$ Ag-sheathed superconducting tape as well as for the powdered and bulk (Tl$\text{}_{0.6}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{y}$ superconductors. For the investigated tape and bulk specimens the low field magnetization showed a deviation from the ideal linear M(H) dependence, which was attributed to the superposition of inter- and intragrain superconducting currents. Fitting of the theoretical magnetization curves to the experimental data allowed for the independent determination of the intragrain critical current densities for the superconducting grains and intergrain critical current densities for the weak link system at 77K.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 633-636
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Critical Temperature of Homologous Series of High-T$\text{}_{c}$ Cuprates as a Function of Number of Layers
    Autorzy:
    Zaleski, T. A.
    Kopeć, T. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038383.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    74.72.-h
    74.50.+r
    Opis:
    We have considered a model of n-layer high-temperature cuprates of homologous series like HgBa$\text{}_{2}$Ca$\text{}_{n-1}$Cu$\text{}_{n}$O$\text{}_{2+2n+δ}$ to determine the dependence of the critical temperature T$\text{}_{c}$(n) on the number n of Cu-O planes in an elementary cell. Focusing on the description of the high-temperature superconducting system in terms of the collective phase variables, we have studied a semi-microscopic anisotropic three-dimensional vector XY model of stacked copper-oxide layers with adjustable parameters representing microscopic in-plane and out-of-plane phase stiffnesses. The model captures the layered composition and block structure along c-axis of superconducting homologous series. Implementing the spherical closure relation we have solved the phase XY model exactly with the help of transfer matrix method for vector variables. The calculated dependence of the critical temperature T$\text{}_{c}$(n) on the block size n is monotonic with n.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 561-567
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling Current into the Vortex Lattice States of s- and p-Wave Superconductors
    Autorzy:
    Kowalewski, L.
    Nogala, M. M.
    Thomas, M.
    Wojciechowski, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012910.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.60.-w
    71.70.Di
    Opis:
    The tunneling current between the metallic tip of a scanning microscope and s-wave and p-wave superconductors in a quantizing magnetic field is investigated. The differential conductance is calculated both as a function of bias voltage at the centre of the vortex line and for varying position of the scanning tunneling microscope tip at a stable voltage.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 237-240
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Josephson Effect in Graphene-Based Junctions
    Autorzy:
    Wojciechowski, R.
    Kowalewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030444.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    74.50.+r
    72.80.Vp
    Opis:
    We study the Josephson effect in graphene based junctions where superconductivity in graphene is induced by the proximity effect from external substrate materials. The electronic properties of the junction is described by the Dirac-Bogoliubov-de-Gennes equations. We consider the junction consisting of two superconductors with different pairing potentials. Using appropriate boundary conditions imposed on the normal region-superconductors interfaces, we calculated the Andreev bound state energy, in the ballistic limit, taking into account two types of reflections namely the retro and specular Andreev reflections.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 632-634
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Transport through a Bending Contact
    Autorzy:
    Schröter, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044664.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    74.50.+r
    74.45.+c
    Opis:
    The so-called "break-junction technique" allows us to realize contacts only single-atom in diameter at their thinnest point. Electronic transport through such narrow constrictions shows a quantum mechanical signature which is well described in a transport channel picture. Each individual contact is characterized by an ensemble of channel transmission probabilities. Preferred total conductance values as well as the number of channels, however, turn out to be universal for the material investigated, despite the lack of control of the exact contact geometry.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 305-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplays between Mesoscopic Josephson Junctions and the Harper Equation
    Autorzy:
    Papp, E.
    Micu, C.
    Bica, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791195.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Cd
    74.50.+r
    74.78.Na
    Opis:
    Proofs are given that by resorting to the discretization of the superconducting phase variable leads to the conversion of the eigenvalue equation of a mesoscopic Josephson junction under a dc voltage into a generalized version of the Harper equation with anisotropy parameter. A full conversion proceeds, however, in terms of selected parameters. Classical limits and further generalizations are also shortly discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 486-488
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Dependent Electron Tunneling in a Ferromagnet Superconductor Ferromagnet Junction
    Autorzy:
    Kowalewski, L.
    Wojciechowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810509.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    74.50.+r
    73.23.Ad
    Opis:
    The coherent spin polarized transport in ferromagnet/superconductor/ferromagnet double barrier junctions is analyzed. Using the Bogolubov-de Gennes equation with appropriate boundary conditions, we calculate probabilities of spin dependent transport processes in the ferromagnet/superconductor/ferromagnet junction. In particular, we discuss the nonlocal processes such as the crossed Andreev reflection and elastic co-tunneling. These processes contribute to tunneling a current when the distance between the two magnetic electrodes is comparable to the superconducting coherence length. The dependences of the tunneling transport processes on the strength of the exchange field in the ferromagnetic electrodes, and on the height of the tunnel barriers are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 257-259
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling and Point Contact Spectroscopy of High-T$\text{}_{c}$ Superconducting Thin Films
    Autorzy:
    Seidel, P.
    Grajcar, M.
    Plecenik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968767.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.80.Fp
    73.40.Gk
    74.50.+r
    Opis:
    Tunneling and point contact junctions between a normal metal and thin high temperature superconducting film were studied to obtain information on surface properties. Surface degradation and time development of contact resistance are investigated as well as peculiarities of the conductance-voltage characteristics. The quasi-linear background is related to carrier transport through degraded surface layer described by a model of inelastic scattering from a broad flat continuum of states inside the potential barrier. An asymmetry of the characteristics appears as the result of low Fermi energy values in the high temperature superconductors in comparison to common metals. An extrinsic nature of these peculiarities is supported by effects of barrier formation by applied voltages in the 1 volt range. As an often observed anomaly a conductance peak at zero bias is observed which can be related to different mechanisms. In the case of high temperature superconductors this zero bias anomaly is related to the d-wave pairing symmetry of the pair potential. Experimental results on YBCO and BSCCO films are compared to calculations taking into account the Andreev reflections for a junction between a normal metal and a d-wave superconductor.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 355-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the Josephson Multi-Junction Systems with Junctions Characterized by Non-Sinusoidal Current - Phase Relationship
    Autorzy:
    Abal'osheva, I. S.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041445.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    85.25.Am
    85.25.Dq
    Opis:
    It is shown that the inclusion of junctions characterized by non-sinusoidal current - phase relationship in the systems composed of multiple Josephson junctions - results in the appearance of additional system phase states. Numerical simulations and stability considerations confirm that these phase states can be realized in practice. Moreover, spontaneous formation of the grain boundary junctions in high-T$\text{}_{c}$ superconductors with non-trivial current-phase relations due to the d-wave symmetry of the order parameter is probable. Switching between the phase states of multiple grain boundary junction systems can lead to additional 1/f noise in high-T$\text{}_{c}$ superconductors.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 687-691
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Polarized Carrier Injection in MOCVD-Grown YBCO/STO/LSMO Heterostructures with Underlying YBCO Layer
    Autorzy:
    Vengalis, B.
    Plaušinaitiene, V.
    Abrutis, A.
    Šaltytė, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041755.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    81.15.Gh
    85.25.-j
    Opis:
    The oxide heterostructures composed of superconducting YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ bottom layer, the overlying ferromagnetic La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ film and SrTiO$\text{}_{3}$ as ultrathin (d≈5 nm) barrier were grown heteroepitaxially onto LaAlO $\text{}_{3}$ substrates by applying pulsed liquid injection metalorganic chemical vapour deposition technique. We report anomalous interface resistance increase with cooling just below superconductive transition temperature (T$\text{}_{c}$≅85 K) and enhanced suppression of supercurrent of strip-like YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ film due to spin-polarized carriers injected from the ferromagnetic manganite layer.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 286-289
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Dependent Tunneling in a Magnetic Field for Junctions Involving Normal and Superconducting CDW Metals
    Autorzy:
    Ekino, T.
    Gabovich, A. M.
    Suan Li, Mai
    Pękała, M.
    Szymczak, H.
    Voitenko, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046730.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.45.Lr
    74.50.+r
    85.75.-d
    Opis:
    The voltage, V, dependences of the differential tunnel conductance G(V) were calculated for two kinds of junctions involving normal and superconducting charge-density-wave metals (CDWMs) in the external magnetic field H. The first is a non-symmetrical junction with a CDWM electrode being biased with respect to a ferromagnet. Calculations show that the paramagnetic splitting occurs between spin-up and spin-down components of G(V), similar to what is observed when a superconducting electrode is used instead of the CDWM one. The second setup is symmetric (CDWM-I-CDWM), where I denotes an insulator. If at least one of the CDWM electrodes is normal and H≠0, G(V) will also be spin-split.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 477-484
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STM Studies of the Proximity Effect in Superconducting Wires with Artificial Pinning Centers
    Autorzy:
    Levi, Y.
    Millo, O.
    Rizzo, N. D.
    Prober, D. E.
    Motowidlo, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968775.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    73.40.Gk
    61.16.Ch
    Opis:
    Scanning tunneling microscopy and spectroscopy were applied to study the proximity effect with nanometer spatial resolution. The measurements were conducted on novel superconducting wires, which consist of an ordered array of submicron diameter normal metal filaments (Cu, Ni) embedded in a superconducting (NbTi) matrix. Spatially resolved information about the local density of states is obtained by taking I-V curves simultaneously with topographic images. Our data provide direct evidence on the interplay between the normal and superconducting constituents in the vicinity of the interface between them.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 425-430
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point-Contact Spectroscopy of Crystalline Electric Field of Heterocontacts $PrB_6$ and $NdB_6$ with Pt
    Autorzy:
    Vasil'ová, M.
    Pristáš, G.
    Reiffers, M.
    Flachbart, K.
    Rusz, J.
    Shitsevalova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813641.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Np
    71.70.Ch
    74.50.+r
    Opis:
    Point-contact spectra of single crystals $PrB_6$ and $NdB_6$ are presented. We observed maxima connected with crystalline electric field excitations in agreement with previous results for applied voltage V>8 mV. Moreover, we observed maxima at 6 mV $(PrB_6)$ and 3 mV $(NdB_6)$, which are probably connected with phonon modes. Moreover, we observed phonon peak at 10.6 mV in $PrB_6$. Further measurements in magnetic fields and crystalline electric field calculations are necessary.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 267-270
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagrammatic Perturbation Technique for a Quantum Dot Connected to Superconducting Leads
    Autorzy:
    Pokorný, V.
    Janiš, V.
    Novotný, T.
    Žonda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201960.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.-m
    73.21.La
    74.50.+r
    Opis:
    We study spectral properties of a quantum dot attached to two superconductors with nonzero phase difference. The system is described as a single-impurity Anderson model coupled to BCS superconducting leads. We utilize diagrammatic perturbation expansion in the Coulomb interaction to capture relevant physical phenomena, particularly the effect of the Coulomb interaction on the Andreev bound states present in the electronic spectrum. Results of the Hartree-Fock and the random phase approximations at zero temperature are presented.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 352-353
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spontaneous Currents in a Ferromagnet-Normal Metal-Superconductor Trilayer
    Autorzy:
    Krawiec, M.
    Annett, J. F.
    Györffy, B. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046734.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.-b
    74.50.+r
    75.75.+a
    Opis:
    We discuss the ground state properties of the system composed of a normal metal sandwiched between ferromagnet and superconductor within a tight binding Hubbard model. We solved the spin-polarized Hartree-Fock-Gorkov equations together with the Maxwell equation (Ampere's law) and found a proximity induced Fulde-Ferrell-Larkin-Ovchinnikov state in this system. Here we show that the inclusion of the normal metal layer in between those subsystems does not necessarily lead to the suppression of the Fulde-Ferrell-Larkin-Ovchinnikov phase. Moreover, we found that depending on the thickness of the normal metal slab the system can be switched periodically between the state with the spontaneous current flowing to that one with no current. All these effects can be explained in terms of the Andreev bound states formed in such structures.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 507-512
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interference Effects on Double Quantum Dots Coupled Between Metallic and Superconducting Leads
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431289.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    Opis:
    We describe the quantum interference effects in the nanodevice consisting of the double quantum dot coupled to the metallic and superconducting electrodes. In such heterostructures the superconducting properties are spread to the quantum dot due to the proximity effect. We investigate the density of states and anomalous Andreev conductance of the interfacial quantum dot exploring the conditions necessary for appearance of the Fano-type lineshapes. We also consider the electron correlations and discuss an interplay between the Coulomb blockade and the Fano-type interference.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 812-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing Fractional Josephson Junction with a Quantum Dot
    Autorzy:
    Stefański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398600.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    73.21.La
    74.78.Na
    74.50.+r
    Opis:
    We consider theoretically a junction between two topological superconducting wires, mediated by a quantum dot. The wires are modelled by the Kitaev chains tuned into topological phase, which possess unpaired Majorana states at their ends. We derive the low energy Hamiltonian of the model. The Majorana states closer to the dot convert into the Dirac fermion inside the dot, forming fractional Josephson junction. The dot is additionally weakly coupled to the normal tunneling probe allowing transport measurement through the dot. When the topological wires are short, the unpaired Majorana end-states can hybridize inside the wire forming an extended Dirac fermionic state. It yields the destruction of the extended state in the dot. We discuss the dependence of the spectral density of the dot and its conductance on superconducting phase. We show that the conservation of parity of the junction, crucial for successful measurement of the fractional effect, can be assured by the gate voltage manipulation of the dot level position and that in case of an unpaired Majorana state in the junction a half conductance quantum can be observed.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 554-557
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-Reversal Invariant Topological Superconductivity in Quasi-One-Dimensional Structures
    Autorzy:
    Mammadova, S.
    Nakhmedov, E.
    Alekperov, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398788.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    71.10.Pm
    71.70.Ej
    74.50.+r
    Opis:
    It is shown that a time-reversal invariant topological superconductivity can be realized in a quasi-one-dimensional structure, which is fabricated by filling the superconducting materials into the periodic channel of dielectric matrices like zeolite and asbestos under high pressure. The topological superconducting phase sets up in the presence of large spin-orbit interactions when s-wave intra-wire and d-wave inter-wire pairings take place. Kramers pairs of Majorana bound states emerge at the edges of each wire. The time-reversal topological superconductor belongs to DIII class of symmetry with a Z₂ invariant.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 800-802
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay between the Correlations and Superconductivity in Electron Transport through the Double Quantum Dots
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428494.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    Opis:
    We study the influence of electron correlations on nonequilibrium transport through the quantum dots coupled between one metallic and one superconducting electrode. Such type of nanodevices are characterized by the induced on-dot pairing spread from the superconducting lead (proximity effect) and effectively responsible for mixing the particle with hole excitations. On the other hand, strong Coulomb repulsion between the opposite spin electrons tends to suppress a double occupancy of the quantum dots competing with the on-dot superconducting order. The Coulomb interactions can also cause a screening of the quantum dot spin by itinerant electrons of the metallic lead giving rise to formation of the Kondo resonance. We analyze interplay of such phenomena for the setup of double quantum dots where the quantum interference (such as Fano) effects influence the subgap electron transport through the Andreev scattering.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1213-1215
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudogap-Like Phenomena in Cuprates as a Manifestation of Charge-Density Waves
    Autorzy:
    Ekino, T.
    Gabovich, A.
    Voitenko, A.
    Suan Li, Mai
    Szymczak, H.
    Pękała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812272.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Jn
    71.45.Lr
    74.50.+r
    74.81.-g
    Opis:
    Differential conductance G as a function of the bias voltage V was measured for break-junctions of superconducting $Bi_2Sr_2CaCu_2O_{8+δ}$ and $YBa_2Cu_3O_{7-δ}$. The dependences G(V) for both materials clearly demonstrate the so-called dip-hump structures outside the gap region. A theory, which suggests the charge-density-wave origin of the dip-hump structures and explains its specific form by intrinsic inhomogeneity of cuprate materials, was developed. The well-known pseudogap features in the tunnel spectra of high-$T_c$ oxides found both below and above the superconducting critical temperature are also described by the theory, which testifies that both the pseudogap and the dip-hump structures have the same origin. Competing theories and various G(V) peculiarities found for a number of superconducting oxides are briefly discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 59-66
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge-Density-Wave Origin of Dip-Hump Structures in the Tunnel Spectra of Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$
    Autorzy:
    Ekino, T.
    Gabovich, A. M.
    Li, M. S.
    Pękała, M.
    Szymczak, H.
    Voitenko, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047318.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Jn
    71.45.Lr
    74.50.+r
    74.81.-g
    Opis:
    We calculated the differential conductance G as the function of the bias voltage V across the tunnel junction between a normal metal or a conventional superconductor and an inhomogeneous superconductor with charge density waves. Spatial averaging over random domains with varying superconducting and normal state properties was carried out. For high-T$\text{}_{c}$ oxides, irregularly distorted charge density wave patterns with spatially scattered values of various parameters were earlier shown to manifest themselves in a great body of experimental data. The results of calculation were applied to explain the well-known dip-hump structure in the G(V) dependence for Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$ and other cuprates.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 573-580
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective Velocity of Soliton in the Presence of a Periodic Background
    Autorzy:
    Pełka, J.
    Zagrodziński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2029259.pdf
    Data publikacji:
    2001-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Md
    42.81.Dp
    74.50.+r
    85.25.Cp
    Opis:
    The effective soliton velocity in the presence of a periodic background differs from that when a soliton propagates alone. Using approximate relations for the Riemann-theta functions, the effective soliton velocity is derived and discussed. General relations are illustrated by examples of Korteweg de Vries and sine-Gordon equations because of the application in the Josephson junction theory.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 6; 871-877
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Properties of Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$-Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ Eutectic
    Autorzy:
    Andrzejewski, B.
    Guilmeau, E.
    Kowalczyk, A.
    Jurga, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047335.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Yz
    74.10.+v
    74.25.Ha
    74.25.Nf
    74.50.+r
    Opis:
    We synthesized, for the first time, superconducting eutectic composed of two new superconducting phases, namely of Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$ and of Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ (where x≈1) and investigated its basic transport, magnetic, and microwave properties. The transition temperatures T$\text{}_{c}$ were equal to 6.6 K and to 8.7 K for Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ and Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$ compound, respectively. The phases present in the eutectic were identified by means of energy dispersion spectroscopy analyses. It was also shown that the two phases in the eutectic were separated by thin boron interface and formed regular network of the Josephson junctions which very effectively absorbed microwave energy.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 727-735
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Majorana States in Presence of Electron Interactions: Spinful Fractional Josephson Junction with a Quantum Dot
    Autorzy:
    Stefański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029763.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    73.21.La
    31.15.V-
    74.50.+r
    Opis:
    We consider a fractional Josephson junction mediated by a quantum dot in which the Zeeman field arising from the magnetic fields driving left and right wires into topological phase can be tuned. Both fields, forming an angle Θp, can be rotated in the common plane perpendicular to the spin-orbit field in the wires. For Θp=0 the dot can be regarded as effectively non-interacting due to the large Zeeman splitting, whereas for Θp ≤sssimπ electron interactions are switched on the dot, affecting Majorana states. The tunnel electrode, weakly coupled to the dot from the top, allows to probe their density of states via conductance measurement. We show that electron interactions renormalize Majorana peak and introduce characteristic asymmetry in the gate voltage dependence of the transverse zero-bias conductance through the dot.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 362-365
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic structure calculations of InP-based coupled quantum dot-quantum well structures
    Autorzy:
    Andrzejewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1160527.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.21.Fg
    73.22.Dj
    74.50.+r
    Opis:
    In this work we investigate the electronic structure of coupled 0D-2D nanostructures. The respective confined state energy levels in a quantum dot-quantum well system are calculated for various conduction band offsets - between the quantum dot and surrounding material. The calculated electron and hole energy levels with their wave functions allow determining if the wave functions are within the injector quantum well or within the quantum dot and if the carrier positions on the energy scale are appropriate from the point of view of a possible laser structure utilizing the so-called tunnel injection scheme. It is shown that for an adequate width of an injector quantum well and the conduction band offsets designing an optimal tunnel injection structure is possible.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-97-A-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Signatures of a Quantum Impurity with Induced Electron Pairing
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374760.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    63.22.-m
    Opis:
    We analyze the effective spectrum of a vibrating molecule coupled between one conducting and another superconducting electrode. The proximity effect induces electron pairing which is manifested by the subgap quasiparticle peaks (the Andreev states) whose broadening depends on a hybridization with the conducting electrode. On the other hand, the electron-phonon interaction leads to a multilevel structure with the polaronic states separated by the phonon energy. We inspect a combined effect of both these (polaronic and induced pairing) phenomena.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-73-A-76
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scanning Probe Microscopy and Spectroscopy of High Temperature Superconductors
    Autorzy:
    de Lozanne, A. L.
    Edwards, H. L.
    Yuan, C.
    Markert, J. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968757.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    74.50.+r
    07.79.Cz
    07.79.Pk
    74.72.Bk
    74.72.Hs
    Opis:
    The authors review recent studies of high temperature superconductors conducted with scanning tunneling and magnetic force microscopes. Emphasis is placed on the importance of surface and probe characterization, both of which are likely to affect the detailed nature of the observations.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 333-342
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Contribution in Thermodynamics and Transport Properties of Ultrathin Ceramic Films
    Autorzy:
    Jaćimovski, S.
    Šetrajčić, J.
    Jaćimovski, M.
    Stojanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205327.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.-h
    73.61.-r
    74.25.fc
    66.30.Xj
    65.40.-b
    Opis:
    The dispersion law, density states of phonons, thermodynamics properties and thermal conductivity was analyzed in this paper. It has been shown that at low temperatures, thermal conductivity of thin film is considerably lower that of bulk-structure. It turned out that phonons in thin film require activation energy for exciting. This leads to extremely low specific heat and specific conductivity at low temperatures. Consequences of quoted facts were discussed in detail and their influence on kinetic and thermodynamic properties of thin films is estimated.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 811-819
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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