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Wyświetlanie 1-15 z 279
Tytuł:
On the Mesoscopic Gate
Autorzy:
Popov, I. Yu.
Popova, S. L.
Powiązania:
https://bibliotekanauki.pl/articles/1943940.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
Opis:
The possibility of constructing of mesoscopic gate controlled by external electric field is shown.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1113-1117
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Magnetic Impurities in Gapless Fermi Systems
Autorzy:
Borkowski, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/1955519.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Qm
75.20.Hr
74.70.Tx
Opis:
In ordinary metals, antiferromagnetic exchange between conduction electrons and a magnetic impurity leads to screening of the impurity spin below the Kondo temperature, T$\text{}_{K}$. In systems such as semimetals, small-gap semiconductors and unconventional superconductors, a reduction in available conduction states near the chemical potential can greatly depress T$\text{}_{K}$. The behavior of an Anderson impurity in a model with a power-law density of states, ρ(ε) ∝ |ε|$\text{}^{r}$, r>0, for |ε|<Δp, where Δp is small compared to the bandwidth, is studied using the non-crossing approximation. The transition from the Kondo singlet to the magnetic ground state can be seen in the behavior of the impurity magnetic susceptibility χ. The product Tχ saturates at a finite value at low temperature for coupling smaller than the critical one. For sufficiently large coupling Tχ → 0, as T → 0, indicating a complete screening of the impurity spin.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 359-362
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energies and Lifetimes of Levels for Doubly Ionized Xenon and Radon
Autorzy:
Eser, S.
Özdemır, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030805.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.ag
31.15.aj
31.15.V-
31.30.-i
Opis:
We have reported the energies and radiative lifetimes of levels for doubly ionized xenon (Xe III) and radon (Rn III). The calculations have been performed using the general-purpose relativistic atomic structure package based on fully relativistic multiconfiguration Dirac-Fock method. We have compared the results obtained from this work for (Xe III) with previous works in available literature. For (Rn III), there is no data except a few energy levels. Hence, we have presented new values on the energy levels of (Rn III).
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1324-1333
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric Dipole Transition Parameters for 5s-5p and 5p-5d Transitions in Doubly Ionized Xenon
Autorzy:
Eser, S.
Özdemir, L.
Powiązania:
https://bibliotekanauki.pl/articles/1032593.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.ag
32.70.Cs
31.15.aj
31.30.-i
31.15.V-
Opis:
Using the general-purpose relativistic atomic structure package based on the fully relativistic multiconfiguration Dirac-Fock method, we have reported the electric dipole transition (E1) parameters such as wavelengths, weighted oscillator strengths, transition rates (or probabilities) and line strengths for 5s-5p and 5p-5d transitions in Xe²⁺. In calculations, the Breit interaction and quantum electrodynamic effects have been included as perturbations. The calculated values for energy levels including valence and core-valence correlation have been compared with other available experimental and theoretical values in literature. Our transition results can provide useful data for, in particular, experimental works in future.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1284-1289
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Order-Disorder Transition in the $Cu_3Au$ (001) Surface Layer Investigated with the Use of DAES and DEPES
Autorzy:
Rok, Ł.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1811500.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
68.35.Rh
Opis:
The composition of the first atomic layer of $Cu_3Au$(001) crystal (about half-and-half copper and gold atoms) changes only slowly even at temperatures much higher than that of the order-disorder transition ($T_C$ = 663 K). Theoretical and experimental works show a general trend of these changes but they differ in quantitative findings. In the present work we used directional elastic peak electron spectroscopy and directional Auger electron spectroscopy to investigate changes of atomic order and composition in the first atomic layers of the $Cu_3Au$(001) crystal during the sample temperature increase. The height of central maximum in DEPES polar profile of the sample investigated was measured as a function of sample temperature. It was found that the measured dependence is linear, but the slope of this dependence changes abruptly around $T_C$. This change seems to be connected with disappearance of the atomic order in the first and second atomic layers. In DAES the height of the Auger peaks for copper and gold low energy transitions (MVV and NVV, respectively) were measured in the dN(E)/dE mode as a function of the primary electron beam incidence angle. The composition of the first, second, and third atomic layers was determined by fitting the ratio of calculated DAES polar profiles for copper and gold to such a ratio for the measured profiles.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-115-S-124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional Auger Electron Spectroscopy - Possibilities, Limitations and Proposal of Improvements
Autorzy:
Mróz, S.
Rok, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1811503.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
68.35.Rh
Opis:
Physical foundations of directional auger electron spectroscopy (DAES) and calculation of DAES profiles in single scattering cluster approach are presented. Limitations of this method (application only to investigation of the crystalline structure of homogeneous samples) is shown and explained as the result of participation of inelastically scattered electrons in the Auger signal generation. To extend the DAES application for the interface structure, the use of as low as possible energy of primary electrons is proposed because in such a case the participation of inelastically scattered electrons becomes negligible and single scattering cluster calculation should describe correctly the DAES profiles for interfaces. Besides, the extension of single scattering cluster calculations to the second elastic scattering is recommended. To check the technical possibility of DAES use in the proposed version, the Auger spectrum of Cu LMM peaks was recorded for a $Cu_3Au$(001) sample with the use of a retarding field analyzer with the primary beam energy 1200 eV. Quality of this spectrum seems to be good enough for using in DAES.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-93-S-101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of the Electron Raman Light Scattering in Normal Metals and Superconductors
Autorzy:
Falkovsky, L.
Klama, S.
Powiązania:
https://bibliotekanauki.pl/articles/1930519.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.Fg
74.20.-z
78.30.Er
Opis:
Within the anisotropic BCS model the temperature dependence of the electron Raman light scattering in normal metals and superconductors is investigated. In either case analytical expressions describing the intensity of scattered light as a function of the Raman frequency and temperature are derived.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 311-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Candidate Insulating Materials for Use in Shock Wave Switches
Autorzy:
Kolosenok, S.
Altgilbers, L.
Powiązania:
https://bibliotekanauki.pl/articles/1807885.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Jp
77.80.Fm
77.84.Lf
81.05.Qk
81.05.Rm
81.65.-b
Opis:
One challenge in high power switching is to have a compact switch, which can hold off high voltages and close rapidly at the proper time. Most high power switches are large or complicated, such as triggered spark gaps. Typical opening switches are also not compact and often have too long switching time. It has been shown previously that certain insulating materials undergo a drastic change in conductivity under shock loading. Using such a material could greatly reduce the size of a switch. We will report on our continuing studies of different candidate materials for shock wave switches.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1010-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensional Reduction and Localization of a Bose-Einstein Condensate in a Quasi-1D Bichromatic Optical Lattice
Autorzy:
Salasnich, L.
Adhikari, S.
Powiązania:
https://bibliotekanauki.pl/articles/1190087.pdf
Data publikacji:
2015-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Nt
03.75.Lm
64.60.Cn
67.85.Hj
Opis:
We analyze the localization of a Bose-Einstein condensate in a one-dimensional bichromatic quasi-periodic optical-lattice potential by numerically solving the 1D Gross-Pitaevskii equation (1D GPE). We first derive the 1D Gross-Pitaevskii equation from the dimensional reduction of the 3D quantum field theory of interacting bosons obtaining two coupled differential equations (for axial wave fuction and space-time dependent transverse width) which reduce to the 1D Gross-Pitaevskii equation under strict conditions. Then, by using the 1D Gross-Pitaevskii equation we report the suppression of localization in the interacting Bose-Einstein condensate when the repulsive scattering length between bosonic atoms is sufficiently large.
Źródło:
Acta Physica Polonica A; 2015, 128, 6; 979-982
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ca Content on the Structure and Properties οf (Co,Ca)O Thin Films Deposited by PLD Technique
Autorzy:
Cieniek, L.
Kac, S.
Powiązania:
https://bibliotekanauki.pl/articles/1537944.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Fg
81.15.-z
81.15.Aa
68.55.-a
68.60.Bs
68.37.-d
68.55.jd
Opis:
In this paper the results of investigations of pure and Ca-doped CoO thin films deposited by PLD technique are presented. The studies carried out for variable Ca content allowed to establish optimal conditions for good quality oxide films preparation. The microstructure, chemical/phase composition and morphology of obtained thin films were examined by means of diverse techniques (SEM, EDS, XPS and XRD). For estimation of deposited Ca-doped CoO films quality the nanohardness and scratch tests (adhesion) were performed. Obtained results confirm that using PLD technique it is possible to carry stoichiometric composition of (Co,Ca)O from target to single crystal substrate and allow to conclude that the calcium dopant concentration (chemical composition) influence on the morphology and measured properties of deposited (Co,Ca)O films.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 803-807
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Raman-Spectroscopy Identification of Ion-Synthesized Ternary Mixed $Ga_{1-x}Al_{x}P$ in Amorphous and Crystalline Phases
Autorzy:
Gotoshia, S.
Gotoshia, L.
Powiązania:
https://bibliotekanauki.pl/articles/1400521.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
78.40.Pg
Opis:
A ternary semiconductor $Ga_{1-x}Al_{x}P$ has been synthesized for the first time by hot implantation of aluminum in GaP. Two mixed crystals of various compositions have been synthesized when implanting by two different fluencies of aluminum ions. The identification of the above mentioned mixed semiconductors in the amorphous as well as in the crystalline phases has been carried out by the laser Raman spectroscopy. The synthesis of the ternary compositions has been carried out at different depths from the substrate surface by implantation of aluminum ions of various energies. $Ga_{1-x}Al_{x}P$ synthesized by the ion implantation shows the behavior of two-mode mixed semiconductors. The synthesized compounds are defective and the Raman spectra prove the fact. The share of disordered structure of the composition synthesized with high fluencies of aluminum ion implantation, $2.5 \times 10^{17} \text{ion}//cm^2$, is especially big.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1680-1688
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Study of Monoclinic RbD$\text{}_{2}$PO$\text{}_{4}$ Monocrystal Doped with Cr$\text{}^{5+}$ Ion
Autorzy:
Waplak, S.
Shuvalov, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/1932129.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
64.60.-i
Opis:
Deuterated monoclinic RbD$\text{}_{2}$PO$\text{}_{4}$ (DRDP) doped with chromium Cr$\text{}^{5+}$ is studied by EPR in 90 K to 400 K temperature range. EPR reveals two types of paramagnetic centers: single Cr$\text{}^{5+}$ (S = 1/2) complex and Cr$\text{}^{5+}$-Cr$\text{}^{5+}$ coupled pairs with effective spin S = 1. The EPR line splitting of single Cr$\text{}^{5+}$ complex in DRDP versus temperature agrees with the unit cell multiplication. The splitting of EPR line of pair spectrum appears at T* = 160 K, far below the phase transition temperatures and is due to the anisotropy of the exchange interaction. The clustering effect in the low-dimensional DRDP is suggested.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 643-648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fano Resonance in a Coupled Electron-Phonon System
Autorzy:
Falkovsky, L. A.
Klama, S.
Powiązania:
https://bibliotekanauki.pl/articles/1955509.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
73.20.Mf
74.25.-q
Opis:
Raman light scattering with excitation of electron-hole continuum and a phonon is investigated theoretically. The effect of a surface and screening of the electron-photon coupling and of the deformation potential as a result of the Coulomb interaction of the electrons is taken into account. The parameters of the 340 cm$\text{}^{-1}$ resonance line in superconducting YBaCuO are estimated by comparing with experimental data.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 347-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin Film of a Superfluid Fermi System in a Magnetic Field
Autorzy:
Harań, G.
Borkowski, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/1887945.pdf
Data publikacji:
1991-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.50.Fi
Opis:
We study the problem of a thin film of neutral fermions in the presence of a magnetic field and scattering on random, uncorrelated irregularities at the boundaries of the film. An attractive interaction of s-wave type is assumed. We solve the equation for the energy gap and demonstrate its dependence on both the field and the scattering strength. The phase diagram is found. There exists a critical point (T$\text{}_{c}^{\star}$, H$\text{}_{c}^{\star}$). For temperatures below T$\text{}_{c}^{\star}$ the phase transition is of the first order and of the second order above it. As expected, the surface scattering significantly reduces the values of the critical field and temperature T$\text{}_{c}$. The critical point changes its position with increasing scattering rate but is not removed from the phase diagram until superfluidity is destroyed.
Źródło:
Acta Physica Polonica A; 1991, 80, 1; 47-60
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of Magnetic and Mechanical Properties in FINEMET-Type Precursor Glasses during Isothermal and Pulse Heat Treatments
Autorzy:
Hubač, L.
Novák, L.
Balla, S.
Lovas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030278.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.30.Gw
75.70.-i
Opis:
The effects on the evolution of coercivity (H_c) and brittleness in FINEMET-type precursor glasses during traditional (isothermal) and pulse heat treatments are compared. The time and temperature dependences of these quantities are monitored during the series of isothermal and pulse heat treatments. The activation energy for H_c relaxation is lower than that for the brittleness evolution, however, dramatic changes in the values of these quantities can be detected above 300°C. Both quantities change mainly with temperature, they are less time-dependent.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 672-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 279

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