173 citations · 391 across the 4 of their papers we have counts for
7 papers
Orbital ordering and one-dimensional magnetic correlation in vanadium spinel oxides AV2O4 (A = Zn, Mg, or Cd)
Yukitoshi Motome, Hirokazu Tsunetsugu
We present our theoretical results on the mechanism of two transitions in vanadium spinel oxides VO (=Zn, Mg, or Cd) in which magnetic V cations constitute a geometri…
Orbital and magnetic transitions in geometrically-frustrated vanadium spinels -- Monte Carlo study of an effective spin-orbital-lattice coupled model --
Yukitoshi Motome, Hirokazu Tsunetsugu
We present our theoretical and numerical results on thermodynamic properties and the microscopic mechanism of two successive transitions in vanadium spinel oxides VO ($A…
Exact low-temperature behavior of kagome antiferromagnet at high fields
M. E. Zhitomirsky, Hirokazu Tsunetsugu
Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter mo…
Magnetic transition and orbital degrees of freedom in vanadium spinels
Hirokazu Tsunetsugu, Yukitoshi Motome
We propose a scenario for the two phase transitions in VO (=Zn, Mg, Cd), based on an effective spin-orbital model on the pyrochlore lattice. At high temperatures, spi…
Metal-Insulator and Superconductor-Insulator Transitions in Correlated Electron Systems
Masatoshi Imada, Fakher F. Assaad, Hirokazu Tsunetsugu +1
Quantum transitions between the Mott insulator and metals by controlling filling in two-dimensional square lattice are characterized by a large dynamical exponent where the o…
Properties of lightly doped t-J two-leg ladders
Matthias Troyer, Hirokazu Tsunetsugu, T. M. Rice
We have numerically investigated the doped t-J ladder using exact diagonalization. We have studied both the limit of strong inter-chain coupling and isotropic coupling. The ladder…