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The magnetic spiral in the frustrated antiferromagnet RbCuCl3 studied by means of neutron diffraction

A neutron diffraction study was performed to study the spiral spin arrangement of RbCuCl3 as a function of temperature and magnetic field. We clearly observe that the spiral lengthens with increasing temperature up to TN = 19.3 K. A shortening of the spiral occurs when a magnetic field is applied within the plane of spin rotation. No change in the propagation vector is observed with the field applied perpendicular to the spin rotation plane. In addition we measured the temperature dependence of the magnetization and close to TN we determine critical exponents β = 0.238(4) and 0.26(1) at zero field and at 13.5 T, respectively.