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

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  • 17 December 1998
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, even for arbitrary values of S. From the limit of weakly coupled chains J_beta<<J_alpha, it is shown that a finite value of J_beta/J_alpha=0.27 is required to switch on a magnetization. The existence of such nonmagnetic states suggests the possibility of spin liquid behavior for intermediate values of the anisotropy.

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