Ferromagnetic phase of a uniaxial magnet with anisotropic biquadratic exchange

Details Ferromagnetic phase of a uniaxial magnet with anisotropic biquadratic exchange Ferromagnetic phase of a uniaxial magnet with anisotropic biquadratic exchange

2010-07-06

arxiv.org/abs/1007.0847v1

ISSN 2071-0186. Ukr. J. Phys. 2010. Vol. 55, No. 3

Physics

Condensed Matter

Other Condensed Matter

6 pages, 2 figures

Scientific paper

The ferromagnetic phase (FMP) of a uniaxial magnet with the easy-plane single-ion anisotropy (SIA) and the anisotropic biquadra\-tic exchange interaction (BQEI) has been studied. The case $S=1$ for the site spin $S$ has been considered. Expressions for two branches of the spin excitation spectrum at finite temperatures $T$ have been obtained, and the conditions for spectral mode stability have been determined. The spectral mode stability diagram in the $T-h$ coordinates has been constructed. The diagram testifies that, under certain conditions, the temperature decrease is accompanied by a violation of the spectral mode stability followed, as the temperature decreases further, by its restoration; i.e. the reentrance phenomenon is observed. The temperature of the second-order phase transition (PT) from the FMP into the phase with spontaneously broken symmetry has been demonstrated to depend considerably on the BQEI anisotropy constant.

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