Premium
Field‐induced effects in the S = 1 two‐dimensional Heisenberg antiferromagnet
Author(s) -
Gouvêa M. E.,
Pires A. S. T.
Publication year - 2005
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.200540070
Subject(s) - condensed matter physics , antiferromagnetism , physics , heisenberg model , magnetic field , field dependence , symmetry (geometry) , field (mathematics) , spin (aerodynamics) , quantum mechanics , mathematics , geometry , pure mathematics , thermodynamics
We use the self‐consistent harmonic approximation to study the spin S = 1 Heisenberg antiferromagnet on a two‐dimensional lattice in a uniform applied magnetic field. The magnetic field destroys the (3) symmetry and an XY ‐like behavior, with a Berezinskii–Kosterlitz–Thouless (BKT) transition, is expected. We obtain the field dependence of the transition temperature for fields varying in a wide range. There has been experimental evidence that, for low dimensional spin systems, a gap can be induced by the applied magnetic field. We also investigate the behavior of this field‐induced gap. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)