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    Wyświetlanie 1-9 z 9
    Tytuł:
    Influence of the Granularity on the Transversal Resistance in Y_{0.55}Pr_{0.45}Ba_2Cu_3O_{7-δ} Superconductor
    Autorzy:
    da Luz, M.
    dos Santos, C.
    Machado, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399293.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.-q
    74.25.Fy
    74.81.Bd
    Opis:
    This work reports longitudinal $(R_{XX})$ and transverse $(R_{XY})$ resistance as a function of temperature measured at low magnetic fields for $Y_{0.55}Pr_{0.45}Ba_2Cu_3O_{7-δ}$ polycrystalline sample. It is observed non-zero transverse resistance at zero applied magnetic field below superconducting transition. The comparison between $R_{XX} (T)$ and $R_{XY} (T)$ curves demonstrate unambiguously that the transverse resistance is related to the double resistive superconducting transition in granular superconductors. I-V curves indicate that the transport properties of the investigated sample are in agreement with the predictions of the two-fluid model.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 702-705
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Transmission through Graphene Bilayer Flakes
    Autorzy:
    Chico, L.
    González, J.
    Santos, H.
    Pacheco, M.
    Brey, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419511.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    73.63.-b
    Opis:
    We investigate the electronic transport properties of a bilayer graphene flake contacted by two monolayer nanoribbons. This finite-size bilayer flake can be built by overlapping two semi-infinite ribbons. We study and analyze the electronic behavior of this structure by means of a tight-binding method and a continuum Dirac model. We have found that the conductance oscillates markedly between zero and the maximum value of the conductance, allowing for the design of electromechanical switches.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 299-303
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friedel Oscillations in Carbon Nanotube Quantum Dots and Superlattices
    Autorzy:
    Chico, L.
    Santos, H.
    Ayuela, A.
    Pelc, M.
    Jaskólski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811922.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    73.90.+f
    Opis:
    Interface states of all-metallic carbon nanotube quantum dots and superlattices are studied within a tight-binding model. We focus on achiral systems made by connecting armchair (n,n) and zigzag (2n,0) tubes with a full ring of n pentagon-heptagon topological defects. We show that the coupling between interface states, which arise from the topological defects, reflects the existence of the Friedel oscillations in the (n,n) tube, with an unusually large decay exponent. We expect this interaction to be important for the understanding of other physical properties, such as selective dot growth, magnetic interaction through carbon tubes or optical spectroscopy of interface states.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1085-1091
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Directional Ordering in Amorphous $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ Ferromagnetic Alloys
    Autorzy:
    Varga, M.
    Varga, R.
    Vojtaník, P.
    Hernando, B.
    Prida, V.
    Santos, J.
    Pérez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1533987.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Nt
    Opis:
    Development of the atomic directional ordering in the $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 804-806
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes
    Autorzy:
    Chico, L.
    Santos, H.
    Ayuela, A.
    Jaskólski, W.
    Pelc, M.
    Brey, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535883.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    73.20.-r
    73.63.Fg
    85.75.-d
    Opis:
    The properties of carbon nanotubes can be dramatically altered by the presence of defects. In this work we address the properties of two different kinds of defective nanotubes: junctions of achiral tubes with topological defects and partially unzipped carbon nanotubes. In particular, we begin by focussing on the interface states in carbon nanotube junctions between achiral tubes. We show that their number and energies can be derived by applying the Born-von Karman boundary condition to an interface between armchair- and zigzag-terminated semi-infinite graphene layers. We show that these interface states, which were thought to be due to the presence of topological defects, are in fact related to the graphene zigzag edge states. Secondly, we study partially unzipped carbon nanotubes, which can be considered as the junction of a carbon nanotube and a graphene nanoribbon, which has edge features giving rise to novel properties. Carbon nanoribbons act as transparent contacts for nanotubes and viceversa, yielding a high conductance. At certain energies, nanoribbons behave as valley filters for carbon nanotubes; this holds considering electron-electron interaction effects. Furthermore, the application of a magnetic field turns the system conducting, with a 100% magnetoresistance. These novel structures may open a way for new carbon-based devices.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 433-441
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Polariton Emission in the Linear Regime
    Autorzy:
    Kłopotowski, Ł.
    Santos, R.
    Amo, A.
    Martín, M. D.
    Viña, L.
    André, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038373.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.36.+c
    71.55.Gs
    78.47.+p
    Opis:
    We studied the dependence of polariton emission dynamics on polariton wave-vector and exciton-photon energy detuning. To reproduce the experimental data, we applied a model that obtains the photonic and the excitonic emission rates of the polariton.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 443-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons
    Autorzy:
    Sánchez, T.
    García, J.
    Santos, J.
    Escoda, Ll.
    Prida, V.
    Sánchez, M.
    Suñol, J.
    Hernando, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507012.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Kj
    75.60.Ch
    Opis:
    The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The $Co_{66}Fe_4Ni_1Si_{15}B_{14}$ and $Fe_{80}B_{20}$ samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 756-758
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Susceptibility Spectroscopy in FeNiSiB Microwires
    Autorzy:
    Olivera, J.
    Gamcova, J.
    Varga, R.
    Santos, J.
    Prida, V.
    Sanchez, M.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813592.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Jk
    Opis:
    Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated $Fe_{77.5-x}Ni_xSi_{7.5}B_{15}$ (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 155-158
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold Atomic Gases in Optical Lattices with Disorder
    Autorzy:
    Schulte, T.
    Drenkelforth, S.
    Kruse, J.
    Ertmer, W.
    Arlt, J. J.
    Kantian, A.
    Sanchez-Palencia, L.
    Santos, L.
    Sanpera, A.
    Sacha, K.
    Zoller, P.
    Lewenstein, M.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044614.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Kk
    03.75.Lm
    05.30.Jp
    64.60.Cn
    Opis:
    Cold atomic gases placed in optical lattices enable studies of simple condensed matter theory models with parameters that may be tuned relatively easily. When the optical potential is randomized (e.g. using laser speckle to create a random intensity distribution) one may be able to observe Anderson localization of matter waves for non-interacting bosons, the so-called Bose glass in the presence of interactions, as well as the Fermi glass or quantum spin glass for mixtures of fermions and bosons.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 89-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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