Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "74.25.Bt" wg kryterium: Temat


Tytuł:
Two-Gap Superconductivity in $2H-NbS_2$
Autorzy:
Pribulová, Z.
Leroux, M.
Kačmarčík, J.
Marcenat, C.
Klein, T.
Rodière, P.
Cario, L.
Samuely, P.
Powiązania:
https://bibliotekanauki.pl/articles/1535279.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.70.Ad
Opis:
We performed specific heat measurements of the superconducting single crystal of $2H-NbS_2$ in the temperature range down to 0.6 K and magnetic fields up to 14 T. The temperature and magnetic field dependence of the electronic specific heat consistently indicate existence of two superconducting energy gaps in the system. The superconducting anisotropy depends on both temperature and magnetic field. Moreover, the angular dependence of the upper critical field deviates from the Ginzburg-Landau behavior and rather reminds that of $MgB_2$. All these features point to a multigap superconductivity in $2H-NbS_2$. Our measurements are in a perfect agreement with the previous scanning tunneling spectroscopy of Guillamón et al.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1024-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heatof the Filled Skutterudite Superconductor LaOs₄As₁₂
Autorzy:
Juraszek, J.
Henkie, Z.
Cichorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398630.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.70.Dd
Opis:
We investigated low-temperature specific heat of the filled skutterudite compound LaOs₄As₁₂ with a transition temperature $T_{c}$ = 3.2 K. A moderate size of a specific-heat jump points at a weak electron-phonon coupling in this material. At T < $T_{c}$, the electronic contribution to the specific heat was found to be at variance with the predictions for an s-wave superconductor with one energy gap. Additionally, we observed an upward curvature of the upper critical field near the transition temperature. Both features provide some indications towards multiband superconductivity, although anisotropy effects as a viable cause of the observed anomalies in LaOs₄As₁₂ cannot be excluded. Similarities to a probable two-band superconductor LaRu₄As₁₂ are discussed.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 597-599
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of the Superconductor $Mo_3Sb_7$
Autorzy:
Tran, V.
Bukowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1812274.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.70.-b
Opis:
We synthesized a polycrystalline sample of the superconductor $Mo_3Sb_7$ and characterized its basic properties by measurements of magnetization, electrical resistivity and specific heat. The measurements establish a superconducting phase transition at $T_c$=2.25 (0.05) K. In applied magnetic fields, the magnetization and resistivity show the behavior of type-II superconductor. From the specific heat measurement, the electronic specific heat coefficient,γ, specific heat jump at $T_c,$ $ΔC(T_c)//γT_c,$ and the Debye temperature $Θ_D$, are evaluated to be 34.5 mJ/(mol $K^2$), 1.56 and 283 K, respectively. From analysis of the specific heat data we suggest that this compound belongs to an intermediate strong coupling regime in the BCS context. The observed enhancement in theγ-value suggests a substantial contribution of Mo-4d-electrons to the density of states. Our experimental data do not support interpretation of superconductivity in $Mo_3Sb_7$ in terms of neither unconventional superconductivity or spin fluctuations proposed previously.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 67-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Microcalorimetry of Superconducting $MgCNi_3$ Single Crystals
Autorzy:
Kačmarčík, J.
Pribulová, Z.
Samuely, P.
Marcenat, C.
Klein, T.
Jang, D.
Lee, H.
Lee, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813689.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Ad
74.25.Bt
Opis:
The low-temperature specific heat of single-crystal samples of superconducting $MgCNi_3$ with typical dimensions 200 μm were measured for the first time. A computer controlled ac microcalorimeter using an optical fiber and an infrared light-emitting diode as the heat source was used down to 2 K at magnetic fields up to 8 T. The specific heat data suggest a moderate coupling in $MgCNi_3$.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 363-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reversible Magnetization of Melt-Processed NEG-123 Superconductor
Autorzy:
Jirsa, M.
Rameš, M.
Muralidhar, M.
Kacmarcik, J.
Marcenat, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/1535270.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Bt
74.25.Op
Opis:
Specific heat of superconducting electrons was measured in a melt-processed $(Nd_{0.33}Eu_{0.38}Gd_{0.28})Ba_2Cu_3O_{y}$ superconductor (NEG-123) with 5 mol% of Gd-211, 1 wt% Ag, and 0.035 mol% of Zn. The thermodynamic characteristics of this compound are still not well known. From calorimetric measurements the reversible magnetization, critical fields, penetration depth, and coherence length were deduced. In the vicinity of $T_{c}$, the reversible magnetic moment was additionally measured by means of SQUID.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1022-1023
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Studies on Isotope Shift Exponent and Pressure Coefficient for Extended Superconductors within BCS Formalism
Autorzy:
Banerjee, B.
Roy, S.
Powiązania:
https://bibliotekanauki.pl/articles/1808029.pdf
Data publikacji:
2009-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.+f
74.25.Bt
74.25.Ha
Opis:
A tight-binding model comprising a hopping and an attractive interaction term was considered for high temperature superconductors. Explicit calculations on the effects of isotopic substitution of atoms and application of pressure on the transition temperatures were made in this work. Exact analytical expressions for the isotope-shift exponent (α) and pressure coefficient $(γ_P)$ of transition temperature $(T_C)$ considering the isotopic mass and pressure dependence of the hopping and attractive interaction strengths from a minimal model describing superconductivity were obtained. Theoretical predictions for α and $γ_P$ with proper choice of parameters are found to be qualitatively consistent with the results of the experiments of high $T_C$ oxides. The results depend on the band dispersion chosen.
Źródło:
Acta Physica Polonica A; 2009, 115, 5; 914-919
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the First Hundred Years of Superconductivity
Autorzy:
Wysokiński, K.
Powiązania:
https://bibliotekanauki.pl/articles/1431128.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.65.+g
74.25.Bt
74.25.F-
Opis:
On the occasion of centenary of superconductivity discovery I recall some facts from the first period and attempts to understand the phenomenon. It turns out that most famous physicists of the first half of XX century have tried to solve the puzzle. Bardeen, Cooper and Schrieffer succeeded in 1957. The BCS theory successfully described all known facts and offered new predictions, which soon have been confirmed experimentally contributing to the widespread acceptance of the theory. It have found applications in nuclear physics, theory of neutron stars and cold atomic gases. The discoveries of new superconductors in the last thirty years show that simple BCS model is not enough to understand new unconventional superconductors. The studies of superconductors develop vividly and still fascinate new generations of physicists working in such diverse fields as material science and string theory.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 721-725
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:
The Isotope Effect of Disordered Superconductors
Autorzy:
Mierzyńska, M.
Wysokiński, K. I.
Powiązania:
https://bibliotekanauki.pl/articles/2038392.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.62.-c
74.62.Dh
Opis:
The isotope effects in disordered weak and strong coupling superconductors of different symmetries of the order parameter have been studied. We have found that even though weak localisation corrections to Eliashberg equations describe a strong degradation of transition temperature with disorder of s-wave superconductors, their influence on isotope coefficient is relatively weak. On the other hand the calculated change of relative isotope coefficient with T$\text{}_{c}$/T$\text{}_{c0}$ in homogeneous thin film materials is similar to that observed in high temperature superconductors.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 647-652
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting parameters of spinel CuRh₂S₄ under pressure
Autorzy:
Ito, M.
Taira, A.
Sonoda, K.
Powiązania:
https://bibliotekanauki.pl/articles/1054874.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Dd
74.62.Fj
74.25.Bt
Opis:
We investigated the magnetic properties of chalcogenide-spinel superconductor CuRh₂S₄ under pressure and estimated the pressure dependence of the superconducting parameters. With increasing pressure, the superconducting transition temperature (T_{c}), thermodynamic critical field (H_{c}), upper critical field (H_{c2}), penetration depth (λ), and GL parameter (κ) increase. Meanwhile, the lower critical field (H_{c1}) is unchanged and the Ginzburg-Landau coherence length (ξ_{GL}) is reduced by pressurization. The increasing value of κ indicates enhanced characteristics of the type-II superconductor CuRh₂S₄.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1450-1453
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

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies