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Domain State of the ANNNI model in Two Dimensions
Fumitaka Matsubara, Takayuki Shirakura, Nobuo Suzuki
We have examined the spin ordering of an axial next-nearest-neighbor Ising (ANNNI) model in two dimensions (2D) near above the antiphase ( phase). We considered…
Ground-State Properties of a Heisenberg Spin Glass Model with a Hybrid Genetic Algorithm
Yuh-ichi Iyama, Fumitaka Matsubara
We developed a genetic algorithm (GA) in the Heisenberg model that combines a triadic crossover and a parameter-free genetic algorithm. Using the algorithm, we examined the ground-…
Gabay-Toulouse Phase Transition in Heisenberg Spin-Glasses in Three Dimensions
T. Shirakura, D. Ninomiya, Y. Iyama +1
We examine three-dimensional Heisenberg models with and without random anisotropies in a magnetic field. We calculate both the stiffness exponent at absolute zero tem…
Phase diagram of a dilute ferromagnet model with antiferromagnetic next-nearest-neighbor interactions
S. Niidera, S. Abiko, F. Matsubara
We have studied the spin ordering of a dilute classical Heisenberg model with spin concentration , and with ferromagnetic nearest-neighbor interaction and antiferromagneti…
Reentrant spin-glass transition in a dilute magnet
S. Abiko, S. Niidera, F. Matsubara
We have performed a large scale Monte Carlo simulation of a dilute classical Heisenberg model with ferromagnetic nearest neighbor and antiferromagnetic next-nearest neighbor intera…
Parisi States in a Heisenberg Spin-Glass Model in Three Dimensions
F. Matsubara, T. Shirakura, Y. Baba
We have studied low-lying metastable states of the Heisenberg model in two () and three () dimensions having developed a hybrid genetic algorithm. We have found a…