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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Thermodynamic Critical Field οf $YNi_2B_2C$ Superconductor
    Autorzy:
    Jarosik, M.
    Szczęśniak, R.
    Szczęśniak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535384.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Fg
    74.25.Bt
    74.25.Ha
    Opis:
    In the presented work the dependence of the thermodynamic critical field $(H_{C})$ on the temperature for the $YNi_2B_2C$ superconductor was determined in the framework of the Eliashberg formalism. The numerical calculations were conducted with the use of the modified transport Eliashberg function. It has been stated that the normalized field function $H_{C}(T)//H_{C}(0)$ correctly reproduces the experimental data.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1031-1033
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Properties of the Superconducting State in $YNi_2B_2C$: The One-Band Eliashberg Approach
    Autorzy:
    Jarosik, M.
    Szczęśniak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505119.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Fg
    74.25.Bt
    74.25.Ha
    Opis:
    The basic thermodynamic parameters of the superconducting state in $YNi_2 B_2 C$ were calculated in the framework of the one-band Eliashberg model. The effective Eliashberg function, determined on the basis of the transport function, was used during calculations. It was shown that the dimensionless ratios are equal to: $R_1$ ≡ 2Δp(0)/$k_{B}$ $T_{C}$ = 3.87, $R_2$ ≡ ΔC($T_{C})//C^{N}(T_{C})$ = 1.79 and $R_3$ ≡ $T_{C} C^{N}(T_{C}) // H_{C}^2(0)$ = 0.159. The value $R_1$ fairly agrees with the experimental data whereas $R_2$ and $R_3$ agree very well.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 863-867
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Strong-Coupling Description of the High-Temperature Superconductivity in the Molecular Hydrogen
    Autorzy:
    Szczęśniak, R.
    Jarosik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431357.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Fg
    74.25.Bt
    74.62.Fj
    Opis:
    The detailed study of the selected thermodynamic properties of the superconducting phase in the molecular hydrogen under the pressure at 428 GPa has been presented. For the increasing value of the Coulomb pseudopotential $μ^{*}$ ∈〈0.08,0.15〉, the following results have been obtained: (i) the critical temperature decreases from 179 K to 141 K, (ii) the ratio $R_{1}$≡ 2Δ(0)/$k_{B}T_{C}$ differs noticeably from the BCS value: $R_{1}$∈〈4.71,3.60〉; (iii) the electron effective mass is large and grows slightly together with the temperature $([m^{*}_{e}//m_{e}]_{max}=2.2 for T = T_{C})$.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 841-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Critical Magnetic Field for Chlorine Halide Superconductor at High Pressure
    Autorzy:
    Szczęśniak, D.
    Szczęśniak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382363.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Fg
    74.25.Bt
    74.62.Fj
    Opis:
    At present, hydrides are considered as a one of the most interesting high-temperature superconductors with the classical electron-phonon pairing mechanism. In the present paper, we have analyzed the dependence of the thermodynamic critical magnetic field $(H_c)$ on the temperature for the chlorine halide superconductor. The calculations have been made in the framework of the Eliashberg formalism for the following pressure values: $p_{1}$=320 GPa and $p_{2}$=360 GPa. We have shown that $H_c$ increases strongly with the increase of the pressure: $[H_c(0)]_{p_{2}}$/$[H_c(0)]_{p_{1}}$= 1.43. Furthermore, the dimensionless ratio: $R_{H}$ ≡ $T_cC^{N}(T_c)$/$H_c^{2}(0)$, where $T_c$ and $C^{N}$ denote the critical temperature and the specific heat of the normal state, differs from the value predicted by the Bardeen-Cooper-Schrieffer theory. In particular: $[R_{H}]_{p_{1}}$=0.166 and $[R_{H}]_{p_{2}}$=0.158.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 344-345
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Characteristics of the Eliashberg Formalism on the Example of High-Pressure Superconducting State in Phosphor
    Autorzy:
    Duda, A.
    Szczęśniak, R.
    Sowińska, M.
    Domagalska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398651.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Fg
    74.25.Bt
    74.62.Fj
    Opis:
    The work describes the properties of the high-pressure superconducting state in phosphor: p∈ {20, 30, 40, 70} GPa. The calculations were performed in the framework of the Eliashberg formalism, which is the natural generalization of the BCS theory. The exceptional attention was paid to the accurate presentation of the used analysis scheme. With respect to the superconducting state in phosphor it was shown that the observed not-high values of the critical temperature ([T_{C}]_{p=30GPa}^\text{max}=8.45 K) result not only from the low values of the electron-phonon coupling constant, but also from the very strong depairing Coulomb interactions. Additionally the inconsiderable strong-coupling and retardation effects force the dimensionless ratios $R_{Δ}$, $R_{C}$, and $R_{H}$ - related to the critical temperature, the order parameter, the specific heat, and the thermodynamic critical field - to take the values close to the BCS predictions.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 649-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Characterization of Novel High-Pressure Close-Packed Superconducting Phase of Boron
    Autorzy:
    Szczęśniak, D.
    Szczęśniak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385110.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Bt
    74.62.Fj
    74.20.Fg
    Opis:
    We report study on the thermodynamic properties of the novel high-pressure superconducting phase of boron with hexagonal P6₃/mcm structure. Our analysis is conducted at the pressure of p=400 GPa, which is motivated by the highest value of the superconducting transition temperature $(T_{C})$ observed previously under such conditions for the P6₃/mcm boron. Our investigations of the thermodynamic properties are performed within the Eliashberg formalism, due to the strong-coupling character of the considered material. In particular, we calculate the thermodynamic properties of the superconducting state which allows us to determine the values of the characteristic dimensionless parameters; the zero-temperature energy gap to the critical temperature, the ratio of the specific heats, as well as the ratio connected with the zero-temperature thermodynamic critical field.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 254-256
    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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