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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 5 Issue 3 (1998) pp 565-569
Spontaneous SU(2) symmetry breaking in one-dimensional quantum antiferromagnet
A.A. Zvyagin (1) (a), D.M. Apal'kov (1)(2)
(1) B.I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Lenin Avenue 47, Kharkov 310164, Ukraine
(2) Kharkov State University, 4 Svobody Place, Kharkov, 310077, Ukraine
Received: 19 January 1998 / Revised: 16 March 1998 / Accepted: 17 March 1998
Abstract: We present a Bethe Ansatz based investigation of a one-dimensional (1D) Heisenberg spin chain in a real 3D crystal lattice. We have shown that due to an influence of the lattice distortion on a crystalline field of ligands of magnetic ions, a Heisenberg antiferromagnetic spin $S = \frac{1} {2}$ chain is unstable under the appearance of a magnetic anisotropy of the "easy-plane" type. The effects of an external magnetic field and nonzero temperature onto such a phase transition are studied.
PACS. 75.10.Jm Quantized spin models [:AND:] 75.30.Gw Magnetic anisotropy - 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
(a) email: az@thp.uni-koeln.de
Article in PDF format (283 KB)
Online publication: October 26, 1998
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