TY - JOUR
T1 - Spin-singlet trimer state induced by competing orbital order in triangular-lattice BaV10O15
AU - Shimizu, Yasuhiro
AU - Matsudaira, Keniichiro
AU - Itoh, Masayuki
AU - Kajita, Tomomasa
AU - Katsufuji, Takuro
PY - 2011/8/23
Y1 - 2011/8/23
N2 - Local spin and orbital textures are investigated by 51V NMR measurements on a triangular-lattice compound BaV10O15 with orbital degrees of freedom and itinerant electrons. The Knight shift shows the spin-singlet V trimer formation in a itinerant phase above the semiconductor-insulator transition temperature TSI=140 K. Below TSI, the observation of the asymmetric electric hyperfine coupling tensor agrees with the orbital order giving direct d-d bonds of the trimer. The remaining paramagnetic spins on a V tetramer exhibit an antiferromagnetic long-range order accompanied by a ferro-type order. The coexistence of the trimer and tetramer with the two opposite magnetism is ascribed to the orbitally induced Peierls instability on a non-half-filling triangular lattice with nonuniform V-V separation.
AB - Local spin and orbital textures are investigated by 51V NMR measurements on a triangular-lattice compound BaV10O15 with orbital degrees of freedom and itinerant electrons. The Knight shift shows the spin-singlet V trimer formation in a itinerant phase above the semiconductor-insulator transition temperature TSI=140 K. Below TSI, the observation of the asymmetric electric hyperfine coupling tensor agrees with the orbital order giving direct d-d bonds of the trimer. The remaining paramagnetic spins on a V tetramer exhibit an antiferromagnetic long-range order accompanied by a ferro-type order. The coexistence of the trimer and tetramer with the two opposite magnetism is ascribed to the orbitally induced Peierls instability on a non-half-filling triangular lattice with nonuniform V-V separation.
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U2 - 10.1103/PhysRevB.84.064421
DO - 10.1103/PhysRevB.84.064421
M3 - Article
AN - SCOPUS:80052364870
VL - 84
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 6
M1 - 064421
ER -