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Superconducting Properties of the Hexagonal‐Close‐Packed Alloy System TcZr
Author(s) -
Chatterjee Parsathi
Publication year - 1984
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.2221240237
Subject(s) - superconductivity , condensed matter physics , scattering , alloy , lattice (music) , materials science , lattice constant , hexagonal crystal system , matrix (chemical analysis) , coupling constant , phonon , work (physics) , physics , quantum mechanics , crystallography , chemistry , diffraction , metallurgy , acoustics , composite material
The theoretical formula of McMillan, modified via the multiple‐scattering theory of Gomersall and Gyorffy, is very successful in computing the electron—phonon coupling constant (λ) and the superconducting transition temperature ( T c ) of elements and compounds from quantities readily obtainable from band structure work or approaches based on the scattering theory. However, for disordered solids this theory fails because of the breakdown of the translational symmetry used in the multiple scattering theory. In the particular case of substitutional alloys, the problem can still be solved however if, at each lattice point, the t ‐matrix of an individual scatterer is replaced by a configurational average of the t ‐matrices of the alloying materials (average t ‐matrix approximation). This modified theory, which has already been successfully applied to some cubic substitutional alloys, is herein used to predict λ and T c for the h.c.p. TcZr alloy system. The results indicate that this system has good superconducting properties.