Phase Transitions in Antiferromagnets in External Magnetic Fields: Mössbauer Spectroscopy

摘要: Known antiferromagnetic materials far out number known ferromagnetic and ferrimagnetic materials. Moreover, the antiferromagnets display a wide variety of phase transitions in addition to paramagnetic transition at Neel point, that make them rich source information about relationship between exchange interactions, structure, phenomena. Mossbauer spectroscopy has been used extensively over last decade study antiferromagnets, capitalizing on fact magnetic hyperfine field is proportional sublattice magnetization. In general, these studies have concentrated determining structure below TN magnetization as function T TN, some cases critical region. Less well studied are those which induced by external fields, although too, can provide important often unique information.