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Spin Fluctuation Depressed Superconductivity in Nb‐V Alloys
Author(s) -
Rapp Ö,
Crafoord C.
Publication year - 1974
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.2220640118
Subject(s) - condensed matter physics , superconductivity , knight shift , electrical resistivity and conductivity , specific heat , superconducting transition temperature , spin (aerodynamics) , relaxation (psychology) , materials science , transition temperature , magnetic susceptibility , thermodynamics , physics , quantum mechanics , psychology , social psychology
The electrical resistivity of Nb‐V alloys has been measured around 250°C. Together with published values of the susceptibility and the electronic part of the specific heat the contribution of spin fluctuations t o the depression of the superconducting transition temperature, T c has been estimated. A calculation of T c based on experimental resistivity, susceptibility, and specific heat and with one adjustable parameter shows qualitative agreement with the observed T c over the whole alloy system and reasonable quantitative agreement in the dilute B V region. Further evidence for the existence of spin fluctuations in Nb‐V and an enhanced electron‐phonon coupling constant γ in V is derived from the observed rate of depression of T c with V concentration, published band structure calculations for V, and published Knight shift relaxation times.