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Coherent potential approximation for the electrical resistivity of partially ordered binary magnetic alloys
Author(s) -
Goedsche F.,
Richter R.,
Vojta G.
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.2220860120
Subject(s) - electrical resistivity and conductivity , coherent potential approximation , condensed matter physics , spins , binary number , scattering , diagonal , alloy , spin (aerodynamics) , binary alloy , range (aeronautics) , order (exchange) , materials science , physics , quantum mechanics , mathematics , thermodynamics , electronic structure , metallurgy , geometry , arithmetic , finance , composite material , economics
The dc electrical resistivity is calculated for a b.c.c. based random binary substitutional magnetic alloy with partial long‐range order for a single‐band tight‐binding model with diagonal disorder, two kinds of localized spins, arbitrary concentrations and arbitrary order parameter. The spin‐disorder contribution to the resistivity is treated by means of the sd exchange model. Within the framework of the CPA up to second order in the scattering potential a general closed resistivity formula is given in terms of alloy parameters and spin parameters. The resitivity is discussed for various special cases in dependence on the long‐range order parameter.