Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rpph...42.1055s&link_type=abstract
Reports on Progress in Physics, vol. 42, June 1979, p. 1055-1084.
Physics
56
Barium Fluorides, Ferromagnetic Materials, Manganese Compounds, Phase Transformations, Antiferromagnetism, Brillouin Effect, Dielectric Properties, High Temperature, Magnetic Effects, Magnetoelectric Media, Phonons, Pyroelectricity, X Ray Analysis
Scientific paper
The physical characteristics of BaMnF4, a pyroelectric ferromagnet, are surveyed. It has the only known continuous antiferroelectric phase transition. Attention is given to such features as the two- and three-dimensional anti-ferromagnetic ordering temperatures, and the exhibition of dielectric anomalies at its Neel temperature. In addition, it is the only known case of a weak ferromagnet with ferromagnetism caused by the linear magnetoelectric effect. At high temperatures its dielectric constant diverges with increasing temperature; a ferroelectric phase transition would occur if the crystals did not melt first. Finally, theory and experiment for this material are reviewed, including neutron, Raman and Brillouin scattering; X-ray, dielectric and conductivity measurements; magnetic resonance and susceptibility studies.
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