Hiroshi Takatsu, Kazuki Goto, Hiromi Otsuka, Ryuji Higashinaka, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Hiroaki Kadowaki
Experimental data of ac susceptibility of the dipolar spin-ice Dy2Ti2O7 in zero magnetic field has been analyzed by Monte Carlo simulations, based on the single-spin-flip Metropolis algorithm. We have directly calculated ac susceptibility and found that the simulated behaviors reasonably reproduce the experiments below about 1 K, where dilute magnetic monopoles diffusively move in the ice-rule obeying ground-state manifold. The conversion factors from the simulation time to real time, i.e., hopping rate of monopoles, strongly depend on temperature.
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http://arxiv.org/abs/1305.1854
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