Raman scattering in a Heisenberg S=12 antiferromagnet on the anisotropic triangular lattice

Natalia B. Perkins, Gia Wei Chern, Wolfram Brenig

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11 Scopus citations

Abstract

We investigate the two-magnon Raman scattering from an anisotropic S=12 triangular Heisenberg antiferromagnet Cs2CuCl4. We find that the Raman response is very sensitive to magnon-magnon interactions and to scattering geometries, a feature that is in remarkable contrast with the polarization-independent Raman signal from the isotropic triangular Heisenberg antiferromagnet. Since a spin-liquid ground state gives rise to a similar rotationally invariant Raman response, our results on the polarization dependence of the scattering spectrum suggest that Raman spectroscopy provides a useful probe, complementary to neutron scattering, of the ground-state properties of Cs2CuCl4, particularly whether the time-reversal symmetry is broken in the ground state.

Original languageEnglish (US)
Article number174423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number17
DOIs
StatePublished - May 22 2013

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