Abstract:
The zero temperature phase diagram of a one-dimensional ferromagnet with cubic single ion anisotropy in an external magnetic field is studied. The mean-field approximation and the density-matrix renormalization group method are applied. Two phases at finite magnetic fields are identified: a canted phase with spontaneously broken symmetry and a phase with magnetization along the magnetic field. Both methods predict that the canted phase exists even for the single-ion anisotropy strong enough to destroy the magnetic order at zero magnetic field. In contrast to the mean-field theory, the density-matrix renormalization group predicts a reentrant behavior for the model. The character of the phase transition at finite magnetic field has also been considered and the critical index has been found.
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Received 9 May 2000 and Received in final form 5 July 2000
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Dudzinski, M., Sznajd, J. & Zittartz, J. Quantum spin model of a cubic ferromagnet in a magnetic field. Eur. Phys. J. B 17, 575–579 (2000). https://doi.org/10.1007/s100510070094
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DOI: https://doi.org/10.1007/s100510070094