Molecular-Field Theory of Phase Transitions in TbP O 4 and in TmAs O 4 </mml:…
1973; American Physical Society; Volume: 8; Issue: 5 Linguagem: Inglês
10.1103/physrevb.8.2004
ISSN0556-2805
Autores Tópico(s)Solid-state spectroscopy and crystallography
ResumoThe crystallographic and magnetic phase transitions observed in TbP${\mathrm{O}}_{4}$ and TmAs${\mathrm{O}}_{4}$ are described phenomenologically. A symmetry-adapted spin Hamiltonian, involving various dipolar and quadrupolar interactions, is constructed and treated in the molecular-field approximation. One or two phase transitions are found according to the values of the interaction parameters, and it is shown that the crystallographic distorsion in the paramagnetic distorted phase is monoclinic. The results are interpreted in terms of the Pytte and Stevens model for rare-earth vanadates.
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