Magnetism

Quantum fluctuations in a two-dimensional antiferromagnet with four-spin interaction of cubic symmetry

V. V. Val'kov^ab, T. A. Val'kova^c, A. A. Shklyaev<sup>a

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b M. F. Reshetnev Siberian State Aerospace University,
^c Siberian Federal University, Krasnoyarsk

Abstract: The excitation spectrum of a non-Heisenberg 2D antiferromagnet with the four-spin interaction of cubic symmetry has been calculated in the first order of 1/2$S$. It has been shown that, for weak anisotropy, the Néel state is destroyed by quantum fluctuations. The phase diagrams showing the stability regions of the Néel phase in the space of spin-anisotropy parameters have been plotted.

Received: 05.04.2011

 English version: Physics of the Solid State, 2011, 53:10, 2061–2066

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