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松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*
Physica B; Condensed Matter, 536, p.372 - 376, 2018/05
被引用回数:2 パーセンタイル:10.36(Physics, Condensed Matter)We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnVO by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.
松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*
Physical Review Letters, 119(1), p.017201_1 - 017201_6, 2017/07
被引用回数:13 パーセンタイル:66.28(Physics, Multidisciplinary)We investigate the magnetic dynamics in the spinel-type vanadium oxide MnVO. Inelastic neutron scattering around 10 meV and a Heisenberg model analysis have revealed that V spin-wave modes exist at a lower-energy region than previously reported. The scattering around 20 meV cannot be reproduced with the spin-wave analysis. We propose that this scattering could originate from the spin-orbital coupled excitation. This scattering is most likely attributable to V spin-wave modes, entangled with the orbital hybridization between orbitals.