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Electron–phonon coupling constant and critical temperature of some A15 superconducting compounds of Nb and V
Author(s) -
Raychaudhury M.,
Chatterjee P.,
Chatterjee S.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220900219
Subject(s) - condensed matter physics , coupling constant , superconductivity , fermi energy , constant (computer programming) , electronic band structure , density of states , coupling (piping) , fermi level , fermi gamma ray space telescope , physics , electron , materials science , quantum mechanics , metallurgy , computer science , programming language
Theoretical calculations are made of the coupling constant, λ, for the A15 compounds Nb 3 Al, Nb 3 Sn, V 3 Si, and V 3 Ge with the help of the theory of Gaspari and Gyorffy. For this purpose Herman‐Skillman potentials are used for the phase shift calculation, and the density of states and the Fermi energy are taken from the band structure calculations of Mattheiss. Using these values of the coupling constant the T c 's are obtained of these materials. These values of T c 's agree fairly well with the experimental values. Since for the highest T c material, Nb 3 Ge, no band structure calculation exists, T c is plotted as a function of the Fermi energy. From the plot, the experimental T c of 23.2 K is reached for E F = 1.330 Ryd.