Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)
Конференция: International Conference on Strongly Correlated Electron Systems (SCES 04); Karlsruhe, GERMANY; Karlsruhe, GERMANY
Год издания: 2005
Идентификатор DOI: 10.1016/j.physb.2005.01.396
Ключевые слова: Mott-hubbard system; magnetism; new materials
Аннотация: Single crystals of Fe1.91V0.09BO4 were prepared by spontaneous crystallization using a solution melt technology for the first time and its structure, electronic and magnetic properties were investigated by X-ray diffraction, Mossbauer spectroscopy, magnetization and electrical measurements. Room-temperature Mossbauer measurements iПоказать полностьюndicate that "localized" (Fe2+, Fe3+) and "delocalized" (Fe2.5+) states in ratio 0.31:0.345:0.345 distributed over two crystallographically non-equivalent positions exist. The results of magnetic measurements show that warwickite is a P-type ferrimagnet below T = 130 K. Resistivity measurements show a variable-range-hopping when electron-electron interactions cause a soft Coulomb gap in the density of states at the Fermi energy. (c) 2005 Elsevier B.V. All rights reserved.
Журнал: PHYSICA B-CONDENSED MATTER
Выпуск журнала: Vol. 359
Номера страниц: 1324-1326
ISSN журнала: 09214526
Место издания: AMSTERDAM
Издатель: ELSEVIER SCIENCE BV