Magnetism of polyanionic compounds of transition metals (Review Article)
I.L. Danilovich1, O.S. Volkova1,2, and А.N. Vasiliev1,2,3
1Московский государственный университет, г. Москва, 119991, Россия 2Уральский федеральный университет, г. Екатеринбург, 620002, Россия
3Национальный исследовательский университет «Высшая школа экономики», г. Москва, 101000, Россия
Received September 30, 2016
The magnetic properties of the polyanionic com-pounds of 3d transition metals noticeably differ from those in monoanionic compounds. The simplest of them can be considered objects in the structure of which there are cations of only one metal in the Ti–Cu series and several different anions (F–, Cl–, Br–, (OH)–, O2–). The metal orbitals overlap differently with the orbitals of halogen, hydroxyl groups and oxygen, which causes a wide spread and competition of various exchange interactions in polyanionic compounds. At the same time, in such compounds there is no exchange via other cations, in particular, nontransition metals. The physics of polyanionic magnetics has been poorly studied, since such objects are usually chemically active and require particular care when performing physical measurements.
PACS: 75.10.Kt Quantum spin liquids, valence bond phases and related phenomena; PACS: 75.30.Et Exchange and superexchange in-teractions; PACS: 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.).
Key words: polyanionic compounds, transition metals, magnetic properties.