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Magnetic States of a Quenched Random Site Heisenberg Magnet with Competitive Exchange Interactions. I. High‐Temperature Magnetic States in Simple and Body‐Centered Cubic Lattices
Author(s) -
Medvedev M. V.,
Zaborov A. V.
Publication year - 1982
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.2221090237
Subject(s) - antiferromagnetism , paramagnetism , condensed matter physics , ferromagnetism , cubic crystal system , spin glass , exchange interaction , heisenberg model , simple (philosophy) , physics , spin (aerodynamics) , magnet , k nearest neighbors algorithm , quantum mechanics , thermodynamics , philosophy , epistemology , artificial intelligence , computer science
For a quenched random site Heisenberg system with competitive nearest‐neighbour exchange interactions ( I AA > 0, I AB ≶0, and I BB < 0) the molecular field distribution functions of various random magnetic structures are derived in the approximation of large nearest‐neighbour number z ( z >> 1). The obtained distribution functions are utilized to discuss magnets with simple (s.c.) and body‐centered cubic (b.c.c.) lattices. It is shown that at high temperatures random collinear ferromagnetic and antiferromagnetic states (and a canted structure as well) can occur at the transition from the paramagnetic state. The occurrence of a spin‐glass state in s.c. and b.c.c. lattices at high temperatures is scarcely probable even in the framework of the molecular field approximation (MFA).