Orbital structures in spinel vanadates AV2O4 (A = Fe, Mn)

Y. Nii, H. Sagayama, T. Arima, S. Aoyagi, R. Sakai, S. Maki, E. Nishibori, H. Sawa, K. Sugimoto, H. Ohsumi, M. Takata

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Abstract

Spinel FeV2O4 exhibits successive structural phase transitions, reflecting the interplay between the Fe2+ (3d6) and V3+ (3d2) ions, both of which have orbital and spin degrees of freedom. The temperature-dependent orbital shapes of Fe2+ and V3 + were investigated by means of single-crystal structure analysis, and were compared with those in MnV2O4, where only the V3+ ions are Jahn-Teller active. The highest-temperature transition from the cubic to the high-temperature tetragonal phase was driven by a ferroic Fe2+ 3z2-r2 orbital order (OO). At 110 K, where the ferrimagnetic transition takes place, the magnetic order modified the orbital shape through intratomic spin-orbit coupling, causing an orthorhombic distortion. The V3 + orbital order (V-OO) contributed to the lowest temperature transition from the orthorhombic to the low-temperature tetragonal phase. The V-OO in FeV2O4 was qualitatively different from that in MnV2O4. We propose that ferro-OO contains a complex orbital in FeV2O4 in contrast to the V-OO of real orbitals observed in MnV2O4.

Original languageEnglish
Article number125142
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number12
DOIs
Publication statusPublished - 2012 Sep 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Nii, Y., Sagayama, H., Arima, T., Aoyagi, S., Sakai, R., Maki, S., Nishibori, E., Sawa, H., Sugimoto, K., Ohsumi, H., & Takata, M. (2012). Orbital structures in spinel vanadates AV2O4 (A = Fe, Mn). Physical Review B - Condensed Matter and Materials Physics, 86(12), [125142]. https://doi.org/10.1103/PhysRevB.86.125142