Physics of the Solid State
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The influence of the external field on phase states of a spin nematic with "easy-axis" single-ion anisotropy
Kosmachev O.A.1, Fadeev E.O.1, Friedman U.A.1, Yarygina E.A.1
1Vernadskii Crimean Federal University, Simferopol, Russia
Email: yuriifridman@gmail.com

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The study has investigated the influence of the external magnetic field on the phase states of the spin nematic with "easy-axis" single-ion anisotropy in the external magnetic field. We have considered a case of predominant biquadratic exchange interaction. The system is studied in two possible geometries: a field parallel to the anisotropy axis and a field perpendicular to the anisotropy axis. It is shown that in both the cases an axial nematic phase is realized in the system, but values of the fields of an axial nematic-paramagnetic state transition are different. Keywords: spin nematic; "easy-axis" single-ion anisotropy; external field; quadrupole ellipsoid.
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