Magnetism of the single crystal Mg-V-O spinel

Shigeo Hara, Hiroyuki Oshima, Takahiro Mastuda, Norio Umeyama, Shin Ichi Ikeda, Miwako Takahashi, Tadataka Watanabe, Keisuke Tomiyasu

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

In MgV2O4 with normal spinel structure (AB 2O4), there is magnetic frustration of V3+ (3d2+) ions located on B-sites, if an antiferromagnetic interaction among B-site spins is essential for its magnetism. The excess Mg substituted materials such as Mg1+xV2-xO4, may construct isolated magnetic triangular lattices, because some of B-sites forming magnetic tetrahedral lattice are substituted by non-magnetic Mg ions, while the normal spinel MgV2O4 contains tetrahedral magnetic ion networks. Here, we have succeeded in growing single crystals of Mg-V-O system spinel oxide by conventional floating-zone method. The valence numbers and abundance ratio of V ions in the single crystal were estimated by wavelength-dispersive X-ray fluorescence analysis and X-ray photoelectron spectroscopy analysis. Although the composition ratio was Mg:V 1:2, a small amount of Mg and V ion partly replace each other between A- and B- sites in this crystal. The composition formula is described as (Mg1-xVx)(V2-xMg x)O4. The single crystal shows magnetic transition at around 12 K and large negative antiferromagnetic Weiss temperature about -840 K, and the frustration parameter f 70 estimated by those temperatures. This result suggests the existence of strong magnetic frustration in our material.

Original languageEnglish
Article number012053
JournalJournal of Physics: Conference Series
Volume320
DOIs
Publication statusPublished - 2011
EventInternational Conference on Frustration in Condensed Matter, ICFCM - Sendai, Japan
Duration: 2011 Jan 112011 Jan 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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