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Electrical resistivity of antiferromagnetic alloys coherent potential approximation
Author(s) -
Borodachev S. M.,
Masharov S. I.,
Volkov V. A.
Publication year - 1977
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.2220840105
Subject(s) - condensed matter physics , electrical resistivity and conductivity , antiferromagnetism , magnetization , coherent potential approximation , scattering , materials science , néel temperature , fermi level , physics , electronic structure , magnetic field , quantum mechanics , electron
The electrical resistivity of a binary antiferromagnetic alloy due to the scattering on spin disorder and on the static potential of a random distribution of different atoms over the lattice is calculated in the coherent potential approximation. The concentration dependences of the contributions to the resistivity due to the spin disorder and elastic scattering as well as of the interference term caused by differences of the atomic levels and exchange constants of the components are obtained. If the Fermi energy is far from the spectrum gap arising with the transition to the antiferromagnetic state, the resistivity of alloys decreases while the magnetization of the sublattices increases. A more complicated behaviour of the resistivity versus magnetization takes place in those alloys in which the Fermi energy is near the spectrum gap. In this case an increase of elastic and spin contributions to the resistivity is possible with antiferromagnetic ordering. This increase of some contributions to the resistivity may be a reason for such anomalies as the maximum or minimum of the total resistivity in the region of the Neel point.