Two-stage ordering of spins in dipolar spin ice on the kagome lattice |
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Authors: | Chern Gia-Wei Mellado Paula Tchernyshyov O |
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Institution: | Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA. |
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Abstract: | Spin ice, a peculiar thermal state of a frustrated ferromagnet on the pyrochlore lattice, has a finite entropy density and excitations carrying magnetic charge. By combining analytical arguments and Monte Carlo simulations, we show that spin ice on the two-dimensional kagome lattice orders in two stages. The intermediate phase has ordered magnetic charges and is separated from the paramagnetic phase by an Ising transition. The transition to the low-temperature phase is of the three-state Potts or Kosterlitz-Thouless type, depending on the presence of defects in the charge order. |
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