Orbital dilution effect in ferrimagnetic Fe1 - XMn xCr2O4: Competition between anharmonic lattice potential and spin-orbit coupling

S. Ohtani, Y. Watanabe, M. Saito, N. Abe, K. Taniguchi, H. Sagayama, T. Arima, M. Watanabe, Y. Noda

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35 Citations (Scopus)

Abstract

Magnetic and structural phase diagram in a spinel-type solid solution system Fe1 - xMnxCr2O4 has been investigated. The cubic-to-tetragonal transition temperature Ts 1 is gradually reduced by the substitution of Mn2+ (3d5) for Jahn-Teller-active Fe2+ (3d6) ions, implying the long-range nature of the ferroic interaction between orbitals. In the paramagnetic tetragonal phase for x < 0.5, the c parameter is shorter than a because of the anharmonicity of the elastic energy. The crystal structure further changes to orthorhombic at around the ferrimagnetic transition temperature TN 1. Ts 1 and TN 1 meet at x = 0.5, and Mn substitution of more than 0.5 gives rise to another tetragonal phase with a < c. The systematic change in crystal structure is discussed in terms of competition between the anharmonic lattice potential and the intra-atomic spin-orbit interaction at Fe2+.

Original languageEnglish
Article number176003
JournalJournal of Physics Condensed Matter
Volume22
Issue number17
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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