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Short‐Range Order and Superconductivity in Binary Alloys Containing V, Nb, and Ta
Author(s) -
Khwaja Farid A.,
Brouers F.
Publication year - 1987
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.2221390222
Subject(s) - superconductivity , degenerate energy levels , niobium , materials science , condensed matter physics , short range order , binary number , coordination number , order (exchange) , range (aeronautics) , physics , ion , quantum mechanics , metallurgy , mathematics , arithmetic , finance , economics , composite material
The problem of superconductivity in V, Nb, and Ta binary solid solutions is discussed in the light of interatomic pair interaction and density of states. Using a tight‐binding recursion method for degenerate d‐bands the superconducting transition temperatures are calculated for equiconcentration VNb, VTa, and NbTa alloys. The theoretical predictions about the existence of clustering of similar atoms in NbTa and ordering in VTa and VNb alloys is confirmed by measuring the values of Cowley's short‐range order parameter α i for these systems. The measured data show negative values of α 1 on the first coordination sphere for VNb and VTa alloys and positive values for NbTa.