161 citations · 555 across the 26 of their papers we have counts for
26 papers
Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO
T. Watanabe, R. Okada, K. Tomiyasu
Ultrasound velocity measurements of the pseudo-cubic spin-crossover cobaltite LaCoO and the lightly Ni-substituted La(CoNi)O reveal two types of symmetry-…
Prominent electron-hole asymmetry in thermoelectric transport of LaCoO
Ryuji Okazaki, Keisuke Tomiyasu
We have measured the electrical resistivity and the thermopower of the electron-doped perovskite cobaltites LaCoTeO. In contrast to the hole-doped systems such as m…
Spin dynamics simulation of the -vortex fluctuations
Yo P. Mizuta, Kazuki Aoyama, Keisuke Tomiyasu +2
Motivated by the recent quasi-elastic neutron scattering experiment, we extend the spin-dynamics simulation on the triangular-lattice Heisenberg antiferromagnet, to observe a sharp…
Observation of topological vortex fluctuations in the frustrated Heisenberg magnet NaCrO
K. Tomiyasu, Y. P. Mizuta, M. Matsuura +2
Spin fluctuations in the triangular-lattice Heisenberg antiferromagnet NaCrO are investigated by means of quasi-elastic neutron scattering with high energy resolution and wide…
Damping of spinful excitons in LaCoO by thermal fluctuations: Theory and experiment
Atsushi Hariki, Ru-Pan Wang, Andrii Sotnikov +7
We present Co -edge resonant inelastic x-ray scattering (RIXS) of bulk LaCoO across the thermally-induced spin-state crossover around 100~K. Owing to a high energy resolut…
Emergent units of itinerant spin-state excitations in LaCoO
K. Tomiyasu, T. Nomura, Y. Kobayashi +3
Spin crossover is expected to enrich unusual physical states in various types of condensed matter. Through inelastic neutron scattering, we study the spin-state excitations in the…