Autor: Durajski, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the Magnetic Penetration Depth in Superconducting Ultrathin Lead Films
Autorzy:: Durajski, A.
Szczęśniak, R.
Powiązania:: https://bibliotekanauki.pl/articles/1032804.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Fg
74.25.Bt
74.62.Fj
Opis:: In the present paper, we report a theoretical study of the magnetic London penetration depth in ultrathin Pb films consisting of five to ten monolayers. Our calculations were performed within the framework of the strong-coupling approach. We observed that for thin films, the thermodynamic parameter exhibits an oscillatory behaviour connected with a quantum size effect. Moreover, we proved that the London penetration depth of Pb films cannot be correctly described using the Bardeen-Cooper-Schrieffer theory of superconductivity due to the strong-coupling and retardation effects. The Eliashberg theory, used in this paper, goes beyond the BCS theory to include these effects which allows to describe the superconducting state on the quantitative level.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 1051-1053
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: On the Ratio of the Energy Gap Amplitude to the Critical Temperature for Cuprates
Autorzy:: Szczęiśniak, R.
Durajski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1382034.pdf
Data publikacji:: 2014-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
74.20.Fg
74.20.Mn
74.25.Bt
74.72.-h
74.72.Bk
74.72.Jt
Opis:: The model for the cuprates based on the modified electron-phonon pairing mechanism has been tested. For this purpose, the superconductors with high value of the critical temperature have been taken into consideration. In particular: $YBa_{2}Cu_{3}O_{7-y}$, $HgBa_{2}CuO_{4+y}$, $HgBa_{2}Cu_{1-x}Zn_{x}O_{4+y}$, and $HgBa_{2}Ca_{2}Cu_{3}O_{8+y}$. It has been shown that the dependence of the ratio $R_{1}$ ≡ $2Δ_\text{tot}^{(0)}$/$k_{B}T_{C}$ on the doping (p) can be properly predicted in the framework of the presented theory; the symbol $Δ_\text{tot}^{(0)}$ denotes the energy gap amplitude at the temperature of zero kelvin, and $T_{C}$ is the critical temperature. The numerical results have been supplemented by the formula which describes the function $R_{1}(p)$.
Źródło:: Acta Physica Polonica A; 2014, 126, 4a; A-92-A-96
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: On the Thermodynamic Critical Field for the $K_3C_{60}$ and $Rb_3C_{60}$ Fullerides
Autorzy:: Durajski, A.
Szczęśniak, R.
Powiązania:: https://bibliotekanauki.pl/articles/1371531.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Fg
74.25.Bt
74.62.Fj
Opis:: In the paper the temperature dependence of the thermodynamic critical field ($H_c$) for the alkali-metal-doped fullerides $K_3C_{60}$ and $Rb_3C_{60}$ has been considered. The numerical calculations have been conducted in the framework of the Migdal-Eliashberg formalism. It has been shown that the obtained numerical values of $H_c$ agree with the experimental data. Finally, the dimensionless ratio: $R_{H}$ ≡ $T_cC^{N}$ ($T_c$)/$H_c^{2}(0)$ has been calculated, where $T_c$ is the critical temperature and $C^{N}$ denotes the specific heat in the normal state. The theoretical analysis has proved that for the considered fullerides the parameter $R_{H}$ is beyond the BCS prediction. In particular: $R_{H}$=0.143 for $K_3C_{60}$, and $R_{H}$=0.145 for $Rb_3C_{60}$.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 342-343
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Pressure Dependence of the Thermodynamic Critical Field in Francium
Autorzy:: Pach, P.
Szczęśniak, R.
Durajski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1384843.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Fg
74.25.Bt
74.62.Fj
Opis:: In the paper, the values of the thermodynamic critical field $(H_{C})$ for francium have been calculated. It has been assumed the wide range of the pressure: p∈ ⟨7.2; 14⟩ GPa. The analysis has been performed in the framework of the strong-coupling formalism. It has been predicted that the value of the ratio $H_{C}(0)$/√ρ(0) increases with the increasing pressure from 3.08 meV to 5.84 meV, where ρ(0) denotes the electron density of states at the Fermi level. The dimensionless parameter $T_{C}C^{N}(T_{C})$/$H²_{C}(0)$ is smaller than in the BCS theory and decreases with pressure from 0.150 to 0.141. The symbol $T_{C}$ represents the critical temperature and $C^{N}$ is the specific heat for the normal state.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 231-233
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Informacja