Abstract
The parallel and perpendicular susceptibility of a single crystal of LiTb0.5Y0.5F4 has been measured in the temperature range 0.32-4.2K. A ferromagnetic transition occurs at Tc=1.119K instead of 2.890K for pure LiTbF4. The critical behaviour of the parallel susceptibility has been accurately studied in the range 5*10-4<t<10-1, where t=(T-Tc)/Tc. A marked effect of dilution by yttrium has been observed. In contrast with pure LiTbF4 where chi /sub /// is well fitted by the theoretically predicted law for uniaxial dipolar ferromagnets (i.e. the classical law with small logarithmic corrections), the usual power law t- gamma with gamma =1.215 seems to hold in LiTb0.5Y0.5F4. This could be related to a reduction of effective dimensionality with dilution.
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