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 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.
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Received: 19 January 1998 / Revised: 16 March 1998 / Accepted: 17 March 1998
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Zvyagin, A., Apal'kov, D. Spontaneous SU(2) symmetry breaking in one-dimensional quantum antiferromagnet. Eur. Phys. J. B 5, 565–569 (1998). https://doi.org/10.1007/s100510050479
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DOI: https://doi.org/10.1007/s100510050479