Thermodynamic Properties of the Superconducting State in the K_{3}C_{60} Fulleride

• Authors: R. Szczęśniak , A. Barasiński
• Languages of publication: EN

Abstracts

EN

In the framework of the Eliashberg formalism, we have calculated the thermodynamic properties of the superconducting state in K_{3}C_{60} (the critical temperature T_C = 19.50 K). We have obtained the following results: (i) The critical value of the Coulomb pseudopotential is equal to 0.387. (ii) The values of the ratios R_1 ≡ 2Δp(0)/k_{B}T_C and R_2 ≡ ΔC(T_C)/C^{N}(T_C) are bigger than in the BCS model; R_1 = 4.01 and R_2 = 1.58. (iii) The electron effective mass m*_{e} reaches the highest value for T = T_C; [m*_{e}]_max = 2.86 m_{e}, where m_{e} is the bare electron mass. Additionally, we have given the analytical expressions for T_C, Δ(T), R_1 and R_2.

Keywords

EN

74.20.Fg; 74.70.Wz

Discipline

• 74.20.Fg: BCS theory and its development
• 74.70.Wz: Carbon-based superconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 6
• Pages: 1053-1058

Dates

published

2009-12

received

2009-05-14

(unknown)

2009-11-10

Contributors

author

R. Szczęśniak

• Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland

author

A. Barasiński

• Institute of Physics, University of Zielona Góra, Prof. Szafrana 4a, 65-516 Zielona Góra, Poland

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Identifiers

DOI

10.12693/APhysPolA.116.1053