Phys. Rev. B 70, 144414 (2004) [10 pages]Anisotropic Heisenberg chain in coexisting transverse and longitudinal magnetic fieldsReceived 2 March 2004; revised 27 May 2004; published 25 October 2004 The one-dimensional spin-1/2 XXZ model in a mixed transverse and longitudinal magnetic field is studied. Using the specially developed version of the mean-field approximation the order-disorder transition induced by the magnetic field is investigated. The ground-state phase diagram is obtained. The behavior of the model in the low transverse field is studied on the basis of conformal field theory. The relevance of our results to the observed phase transition in the quasi-one-dimensional antiferromagnet Cs2CoCl4 is discussed. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.144414
DOI:
10.1103/PhysRevB.70.144414
PACS:
75.10.Jm
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