A determination of the critical exponent beta in TbVO4and DyVO4using linear birefringence
- 7 November 1975
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 8 (21) , L451-L455
- https://doi.org/10.1088/0022-3719/8/21/008
Abstract
The authors have measured the critical exponent beta in TbVO4 and DyVO4, using liner birefringence to measure the order parameter. It is found that TbVO4 shows classical mean-field behaviour with beta =0.50+or-0.02, whereas DyVO4 shows fluctuation-dominated Ising-like behaviour with beta =0.34+or-0.02. This result is consistent with other measurements of the range of the interactions coupling the rare-earth ions. In DyVO4, the departure from mean-field behaviour appears to be due to a fortuitous cancellation of long-range components in the inter-ion coupling.Keywords
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