Spin wave analysis to the spatially-anisotropic Heisenberg antiferromagnet on triangular lattice

Abstract

We study the phase diagram at T=0 of the antiferromagnetic Heisenberg model on the triangular lattice with spatially-anisotropic interactions. For values of the anisotropy very close to J_alpha/J_beta=0.50, conventional spin wave theory predicts that quantum fluctuations melt the classical structures, for S=1/2. For the regime J_beta<J_alpha, it is shown that the incommensurate spiral phases survive until J_beta/J_alpha=0.27, leaving a wide region where the ground state is disordered. The existence of such nonmagnetic states suggests the possibility of spin liquid behavior for intermediate values of the anisotropy.

Revised version, 4 pages, Latex (twocolumn), 4 figures as eps files. To appear in PRB

References in corpus (2)

• Similarities between organic and cuprate superconductors
• Collinear Néel-type ordering in partially frustrated lattices

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