Landau theory of the magnetic phase diagram of CsMnBr 3
1990; American Physical Society; Volume: 41; Issue: 4 Linguagem: Inglês
10.1103/physrevb.41.2543
ISSN1095-3795
Autores Tópico(s)Advanced Condensed Matter Physics
ResumoThe magnetic-field--temperature phase diagram of ${\mathrm{CsMnBr}}_{3}$ determined by recent neutron-scattering results is explained here by an investigation of a previously developed nonlocal Landau-type free energy. The degeneracy of helically and linearly polarized spin configurations at the N\'eel temperature is broken by a magnetic field and is shown to be responsible for the novel type of multicritical point observed at T=${T}_{N}$, H=0. The theory also accounts for the spin structures of the observed ordered phases as well as the temperature dependences of the phase boundaries.
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