Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Phys Rev Lett. 2011 May 20;106(20):207202. doi: 10.1103/PhysRevLett.106.207202.
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.
自旋冰是一种在反铁磁体的 pyrochlore 晶格中出现的特殊热态，具有有限的熵密度和携带磁荷的激发。通过结合分析论证和蒙特卡罗模拟，我们发现 kagome 晶格上的自旋冰在两个阶段中进行有序化。中间相有序化磁荷，与顺磁相由伊辛相变分隔。向低温相的转变是三态 Potts 或科斯特利茨- Thouless 型，这取决于电荷有序中的缺陷存在情况。
