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In low magnetic field, the stacked, triangular antiferromagnet CsCuCl3 has ahelical structure incommensurate (IC) in the chain direction. The IC wavenumber(from neutron-diffraction experiments) decreases with increasing fieldtransverse to the chains, as predicted by classical theory, but then it has aplateau almost certainly caused by quantum fluctuations. Linear spin-wavetheory fails because fluctuations have particularly large effects in the ICphase. An innovative phenomenological treatment of quantum fluctuations yieldsa plateau at approximately the observed value and the observed fields; itpredicts a transition to the commensurate phase so far not observed. Resultsdepend sensitively on a weak anisotropy.Comment: REVTeX, 12 pages, 4 .ps figures, Phys. Rev.

physical review. b, condensed matter

Quantum fluctuations in the incommensurate phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CsCuCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>in a transverse magnetic field

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field