The superexchange interactions in mixed Co-Fe ludwigite

Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1016/j.jmmm.2010.09.057

Ключевые слова: Ludwigite structure, Magnetic susceptibility, Magnetic frustration, Mott conductivity, Ludwigite structure, Magnetic frustration, Magnetic susceptibility, Mott conductivity, AC susceptibility, Cation distributions, Crystal data, Crystallographic sites, Electrical resistivity, Iron atoms, Low temperatures, Ludwigite structure, Magnetic behavior, Magnetic frustrations, Magnetic system, Magnetic transitions, Mossbauer, Mossbauer effects, Mott conductivity, Mott hopping, Superexchange energy, Superexchange interaction, Temperature regions, Trivalent iron, Variable range, Cobalt, Electric conductivity, Magnetic susceptibility, Magnetism, Mossbauer spectroscopy, X ray diffraction, Crystal structure

Аннотация: The crystal structure, cation distribution and exchange interactions in the Co2.25Fe0.75O2BO3 ludwigite have been explored through X-ray diffraction, electrical resistivity, ac-susceptibility and Mossbauer effect measurements. The crystal data have shown that iron atoms occupy the most symmetric crystallographic sites Fe4 and Fe2. The complex magnetic behavior with two magnetic transitions near 70 and 115 K at low temperatures was found. The Mossbauer data have displayed the trivalent iron states only. The values of superexchange energies have been estimated for Co3O2BO3 and Co2.25Fe0.75O2BO3 yielding a significant role of frustrations in the ludwigite magnetic system. Variable range Mott hopping conductivity law was proved to be valid in the wide temperature region, pointing out a localized character of charge carriers rather than collective. (C) 2010 Elsevier B.V. All rights reserved.

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Издание

Журнал: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Выпуск журнала: Vol. 323, Is. 5

Номера страниц: 521-527

ISSN журнала: 03048853

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

Авторы

  • Kazak N.V. (L.V. Kirensky Institute of Physics,SB of RAS)
  • Bayukov O.A. (L.V. Kirensky Institute of Physics,SB of RAS)
  • Ovchinnikov S.G. (L.V. Kirensky Institute of Physics,SB of RAS)
  • Vasiliev A.D. (Siberian Federal University)
  • Rudenko V.V. (L.V. Kirensky Institute of Physics,SB of RAS)
  • Ivanova N.B. (Krasnoyarsk State Agrarian University)
  • Knyazev Y.V. (Siberian Federal University)
  • Bartolom J. (Instituto de Ciencia de Materiales de Aragn,CSIC-Universidad de Zaragoza Abd,Departamento de Fsica de la Materia Condensada)
  • Arauzo A. (Servicio de Instrumentacin Cientficarea de Medidas Fsicas,Universidad de Zaragoza)

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