TY - JOUR
T1 - Magnetism of the single crystal Mg-V-O spinel
AU - Hara, Shigeo
AU - Oshima, Hiroyuki
AU - Mastuda, Takahiro
AU - Umeyama, Norio
AU - Ikeda, Shin Ichi
AU - Takahashi, Miwako
AU - Watanabe, Tadataka
AU - Tomiyasu, Keisuke
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
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U2 - 10.1088/1742-6596/320/1/012053
DO - 10.1088/1742-6596/320/1/012053
M3 - Conference article
AN - SCOPUS:81055144292
VL - 320
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
M1 - 012053
T2 - International Conference on Frustration in Condensed Matter, ICFCM
Y2 - 11 January 2011 through 14 January 2011
ER -