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.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2011|
|Event||International Conference on Frustration in Condensed Matter, ICFCM - Sendai, Japan|
Duration: 2011 Jan 11 → 2011 Jan 14
ASJC Scopus subject areas
- Physics and Astronomy(all)