Bosonic mean-field theory for frustrated Heisenberg antiferromagnets in two dimensions

Chitra, R and Rao, Sumathi and Diptiman, Sen and Suresh, Rao R (1995) Bosonic mean-field theory for frustrated Heisenberg antiferromagnets in two dimensions. In: Physical Review B, 52 (2). pp. 1061-1069.

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Abstract

We use a recently developed bosonic mean-field theory to study the ordered ground states of frustrated Heisenberg antiferromagnets in two dimensions. We emphasize the role of condensates in satisfying the mean-field variational equations and their relation to spin-correlation functions at low temperatures. This mean-field theory is closely related to a spin-wave theory that enables us to obtain the spin-wave spectrum easily (without any rotation of axes) for an entire class of three-dimensionally ordered states. For the frustrated Heisenberg antiferromagnet on a triangular lattice, we use this theory to compute the spin-wave spectrum for all values of $J_2/J_1$ and demonstrate the phenomenon of order from disorder.

Item Type:	Journal Article
Additional Information:	Copyright of this artcile belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Theoretical Studies Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Jun 2007
Last Modified:	19 Sep 2010 04:38
URI:	http://eprints.iisc.ernet.in/id/eprint/11135

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