Premium
Thermodynamic properties of a spin‐1 antiferromagnetic chain with an anisotropy at a finite temperature
Author(s) -
Li JiaLiang,
Zhu SuHua
Publication year - 2003
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.200301893
Subject(s) - condensed matter physics , antiferromagnetism , anisotropy , internal energy , magnetic field , spin (aerodynamics) , physics , field (mathematics) , heisenberg model , magnetic anisotropy , magnetization , thermodynamics , quantum mechanics , mathematics , pure mathematics
In this paper a self‐consistent mean‐field approximation is used to study the thermodynamic properties of a spin‐1 antiferromagnetic Heisenberg chain with an anisotropy in the presence of an external magnetic field at a finite temperature. The temperature dependences of the internal energy, Haldane gap, and correlation length are presented. It is found that the internal energy and Haldane gap increase with increasing temperature, while the correlation length decreases for a fixed magnetic field and single‐ion anisotropy. The magnetic field splits the Haldane gap into two branches: the upper branch increases with increasing magnetic field while the other branch decreases. The numerical results are consistent with those of other theoretical methods. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)