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Magnetic Properties of New Layered Heisenberg Antiferromagnets
Author(s) -
Du A.,
Wei G. Z.
Publication year - 1993
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.2221770118
Subject(s) - antiferromagnetism , spins , condensed matter physics , ferromagnetism , heisenberg model , magnetization , spin (aerodynamics) , coupling (piping) , atmospheric temperature range , physics , spin wave , materials science , quantum mechanics , magnetic field , thermodynamics , metallurgy
The magnetic properties of layered Heisenberg antiferromagnets with antiferromagnetic interaction between spins within a layer and ferromagnetic interaction between layers are studied by using a spin‐wave theory and double time‐temperature spin Green's function theory. At low temperatures a characteristic temperature is defined reflecting the layered features of the system and the low‐temperature region is divided into two new ones, giving asymptotic expressions of sublattice magnetization and parallel suseeptibility in different temperature region, including the low‐temperature region. the vicinity of the Néel temperature, and the high‐temperature region. Also given is the Néel temperature in an asymptotic form when the interlayer coupling is weak. It is shown that the characteristies of dimensional cross‐over for physical quantities exists at low temperatures. The interlayer coupling is essential to keep long‐range ordering and the properties of this king of antiferromagnets are very similar to those of normal antiferromagnets.