Effect of dilution on the critical behaviour of a dipolar uniaxial ferromagnet: Magnetic susceptibility of LiTb0.5Y0.5F4
- 30 January 1980
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 13 (3) , 395-401
- https://doi.org/10.1088/0022-3719/13/3/014
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*10-4-1, 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.Keywords
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