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The layered spiral magnet Cs2CuCl4 displays several interesting propertiesthat have been suggested as evidence of proximity to a two dimensional quantumspin liquid. In this paper we study a concrete version of this proposal andsuggest experiments that can potentially confirm it. We study universalcritical properties of two-dimensional frustrated quantum magnets near thequantum phase transition between a spiral magnetic state and a spin liquidstate with gapped bosonic spinons in the framework of the O(4) invariantcritical theory proposed earlier(Chubukov et al, cond-mat/9402006). Directnumerical calculation of the anomalous exponent in spin correlations shows thatthe critical scattering has broad continua qualitatively similar to experiment.More remarkably we show that the enlarged O(4) symmetry leads to the same slowpower law decay for the vector spin chirality and the Neel correlations. Weshow how this may be observed through polarized neutron scattering experiments.A number of other less dramatic consequences of the critical theory areoutlined as well.Comment: 9 pages, 2 figure

physical review. b, condensed matter and materials physics

Ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: Possibility of a proximate spin liquid

Ordering inCs2CuCl4: Possibility of a proximate spin liquid