Raman scattering for triangular lattices spin-1/2 Heisenberg antiferromagnets

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Published 23 March 2007 IOP Publishing Ltd
, , Citation F Vernay et al 2007 J. Phys.: Condens. Matter 19 145243 DOI 10.1088/0953-8984/19/14/145243

0953-8984/19/14/145243

Abstract

Motivated by various spin-1/2 compounds like Cs2CuCl4 or κ-(BEDT-TTF)2Cu2(CN)3, we derive a Raman-scattering operator à la Shastry and Shraiman for various geometries. For T = 0, the exact spectra are computed by the Lanczos algorithm for finite-size clusters. We perform a systematic investigation as a function of J2/J1, the exchange constant ratio: ranging from J2 = 0, the well known square-lattice case, to J2/J1 = 1 the isotropic triangular lattice. We discuss the polarization dependence of the spectra and show how it can be used to detect precursors of the instabilities of the ground state against quantum fluctuations.

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