A-type antiferro-orbital ordering with I41/a symmetry and geometrical frustration in the spinel vanadate MgV2O4

S. Niitaka, H. Ohsumi, K. Sugimoto, S. Lee, Y. Oshima, K. Kato, D. Hashizume, T. Arima, M. Takata, H. Takagi

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17 Citations (Scopus)

Abstract

We conduct a detailed structural analysis of the S=1 pyrochlore antiferromagnet MgV2O4, which exhibits an antiferromagnetic ordering marginally at TN=40 K, triggered by a structural transition from cubic to tetragonal symmetry at TS=62 K, using high resolution synchrotron x-ray diffraction and convergent beam electron diffraction. We reveal that the tetragonal phase below TS has the symmetry of I41/a and that the distortion pattern of VO6 octahedra is consistent with A-type antiferro-orbital ordering with alternating stacking of layers with yz/xy orbital chains and zx/xy orbital chains along the tetragonal c axis. This implies that an anisotropic coupling of V moments produced by the orbital ordering below TS primarily brings about the antiferromagnetic ordering.

Original languageEnglish
Article number267201
JournalPhysical review letters
Volume111
Issue number26
DOIs
Publication statusPublished - 2013 Dec 26
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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