Magnetic phase diagrams of classical triangular and kagome antiferromagnets

Gvozdikova, M. V.; Melchy, P. E.; Zhitomirsky, M. E.

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Magnetic phase diagrams of classical triangular and kagome antiferromagnets

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Zhitomirsky, M. E.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Gvozdikova, M. V., Melchy, P. E., & Zhitomirsky, M. E. (2011). Magnetic phase diagrams of classical triangular and kagome antiferromagnets. Journal of Physics-Condensed Matter, 23(16 Sp. Iss. SI): 164209.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8D17-8

Abstract

We investigate the effect of geometrical frustration on the H-T phase diagrams of the classical Heisenberg antiferromagnets on triangular and kagome lattices. The phase diagrams for the two models are obtained from large-scale Monte Carlo simulations. For the kagome antiferromagnet, thermal fluctuations are unable to lift degeneracy completely and stabilize translationally disordered multipolar phases. We find a substantial difference in the temperature scales of the order by disorder effect related to different degeneracy of the low-and the high-field classical ground states in the kagome antiferromagnet. In the low-field regime, the Kosterlitz-Thouless transition into a spin-nematic phase is produced by unbinding of half-quantum vortices.