Low-Dimensional Magnetism in Namibite Cu(BiO)2VO4OH

Авторы: Shvanskaya L.V., Bushneva T.D., Ivanova A.G., Pchelkina Z.V., Vasil’chikova T.M., Volokova O.S., Vasil’ev A.N.
Журнал: Journal of Experimental and Theoretical Physics
Том: 137
Номер: 4
Год издания: 2023
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 520
Последняя страница: 525
Аннотация: Abstract—A synthetic analog of rare secondary mineral namibite Cu(BiO)2VO4OH has been obtained by thehydrothermal method. The crystal structure of this compound contains isolated uniform chains of vertexconnected copper–oxygen octahedra. Magnetic susceptibility (χ) and magnetization (M) measurementshave not indicated the long-range order in the temperature interval 2–300 K. Specific heat (Cp) measurements suggest the formation of a spin-liquid state at low temperatures. X-band electron paramagnetic resonance data recorded at low temperatures have demonstrated only a signal from impurities. First-principlescalculations have estimated the exchange interaction in the chains as J = 555 K, whereas exchange interactions between the chains turn out to be one to two orders of magnitude smaller. Thus, namibite represents arare example of an unordered half-integer spin chain.
Добавил в систему: Шванская Лариса Викторовна

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