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Sublattice Magnetization and Néel Temperature of a Tetragonal Antiferromagnet
Author(s) -
Du A.,
Li G. M.,
Wei G. Z.
Publication year - 1997
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 - 10.1002/1521-3951(199710)203:2<517::aid-pssb517>3.0.co;2-s
Subject(s) - condensed matter physics , magnetization , antiferromagnetism , tetragonal crystal system , ground state , anisotropy , heisenberg model , bilayer , spin (aerodynamics) , physics , chemistry , phase (matter) , quantum mechanics , thermodynamics , magnetic field , biochemistry , membrane
By means of spin‐wave theory and spin Green function theory, we calculate the sublattice magnetization and Néel temperature of a layered Heisenberg antiferromagnet, in which two nearest‐neighbour layers are grouped in a bilayer and two nearest‐neighbour bilayers are coupled antiferromagnetically. We find that small XY anisotropy has significant influence on the Néel temperature, but has little influence on the sublattice magnetization at zero temperature and the ground state energy. The sublattice magnetization and Néel temperature calculated for YBa 2 Cu 3 O 6+ x ( x = 0.15) are in good agreement with the experimental values. For small interlayer coupling and small XY anisotropy, the Néel temperature can be expressed in an asymptotic form.