Elastic neutron scattering study of magnetic phase transitions in DyPO4 and HoPO4

Neutron diffraction measurements have been made on single crystals of the two metamagnets DyPO4 and HoPO4 to locate the tricritical points in these substances. In the process of the experiments an effect has been discovered which allows the accurate determination of these points. This effect is the...

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Bibliographic Details
Published in:Journal of applied physics 1979-03, Vol.50 (B3), p.2011-2013
Main Authors: Millhouse, A. H., Steiner, M., Dachs, H.
Format: Article
Language:English
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Summary:Neutron diffraction measurements have been made on single crystals of the two metamagnets DyPO4 and HoPO4 to locate the tricritical points in these substances. In the process of the experiments an effect has been discovered which allows the accurate determination of these points. This effect is the sensitivity of the extinction of magnetic reflections to the changing domain configurations in the mixed phase below the tricritical point. Relaxation effects have been observed in the antiferromagnetic domain formation below the first order phase transition. For DyPO4 the tricritical temperature is found to be 2.07±0.05 K. In HoPO4 these extinction effects were found to be small and the deviation of the up-moment sublattice magnetization from the mean-field-theory result was used to locate the tricritical temperature at 1.0±0.1 K.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.327142