S
Seiji Miyashita
Researcher at University of Tokyo
Publications - 388
Citations - 7449
Seiji Miyashita is an academic researcher from University of Tokyo. The author has contributed to research in topics: Phase transition & Ising model. The author has an hindex of 42, co-authored 376 publications receiving 6794 citations. Previous affiliations of Seiji Miyashita include National Institute for Materials Science & Kyoto University.
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Phase Transition of the Two-Dimensional Heisenberg Antiferromagnet on the Triangular Lattice
Hikaru Kawamura,Seiji Miyashita +1 more
TL;DR: In this paper, the antiferromagnetic Heisenberg model on the two-dimensional triangular lattice is studied both by topological analysis of defects and by Monte Carlo simulation, and it is shown that the order parameter space of this model is isomorphic to the three-dimensional rotation group SO(3) due to the inherent frustration effect.
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Nature of the Phase Transition of the Two-Dimensional Antiferromagnetic Plane Rotator Model on the Triangular Lattice
Seiji Miyashita,Hiroyuki Shiba +1 more
TL;DR: In this paper, a study on the antiferromagnetic plane rotator model on the triangular lattice by Monte Carlo simulations is presented, where the specific heat shows a logarithmic divergence at a critical temperature and the magnetic susceptibility is almost independent of temperature over a wide temperature range.
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Monte Carlo Simulation of Quantum Spin Systems. I
TL;DR: A general explicit formulation of Monte Carlo simulation for quantum systems is given in this article on the basis of the previous fundamental proposal by Suzuki, and new interesting physical results on the two-dimensional XY-model are given.
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Phase Transition of the Heisenberg Antiferromagnet on the Triangular Lattice in a Magnetic Field
Hikaru Kawamura,Seiji Miyashita +1 more
TL;DR: In this paper, the phase transitions of the two-dimensional classical Heisenberg antiferromagnet on the triangular lattice were studied in the presence of magnetic fields and three types of ordered phase and successive phase transitions among them were found.
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Simple two-dimensional model for the elastic origin of cooperativity among spin states of spin-crossover complexes.
TL;DR: A simple model of SC with intra and intermolecular potentials is developed which accounts for the elastic interaction including the effect of the inhomogeneity of the spin states and applies constant temperature molecular dynamics based on the Nosé-Hoover formalism.