Magnetism

Specific features of the formation of phase states in a non-Heisenberg magnet with $S = 2$

O. A. Kosmachev, Yu. A. Fridman

Vernadskiy Tavricheskiy National University, Simferopol'

Abstract: Spin states of a non-Heisenberg magnet with a magnetic ion spin of $2$ have been determined. It has been shown that the inclusion of the higher-order spin invariants leads to realization of specific phases with the tensor order parameters whose realization is impossible in magnets with $S = 1$. The free energy of the system in different spin states has been studied. The geometric images of the tensor phases in the spin space have been determined.

Received: 01.08.2012

 English version: Physics of the Solid State, 2013, 55:4, 737–742

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