Specific heat of kagome ice in the pyrochlore oxide DY2Ti2O7
Specific heat of kagome ice in the pyrochlore oxide DY2Ti2O7
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DOI：
10.1143/jpsj.72.411
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发表时间：
2003-02-01
影响因子：
1.7
通讯作者：
Sakakibara, T
中科院分区：
文献类型：
--
作者：
Hiroi, Z;Matsuhira, K;Sakakibara, T
通过比热测量研究了自旋冰化合物Dy_2 Ti_2 O_7在沿着[111]方向磁场作用下的一种新的宏观简并态--kagome冰.剩余熵的戈薇冰估计为0.65 J/K摩尔Dy，这是近40%的四面体自旋冰在零场（1.68 J/K摩尔Dy），并在很好的符合理论预测。另据报道，在0.3-0.6 T的磁场范围内稳定的可果美冰态为“气相”，在1 T的临界磁场下凝结成熵接近零的“液相”。
A novel macroscopically degenerate state called kagome ice, which was recently found in a spin ice compound Dy2Ti2O7 in a magnetic field applied along the [111] direction of the cubic unit cell, is studied by specific heat measurements. The residual entropy of the kagome ice is estimated to be 0.65 J/K mol Dy, which is nearly 40% of that for the tetrahedral spin ice obtained in a zero field (1.68 J/K mol Dy) and is in good agreement with a theoretical prediction. It is also reported that the kagome ice state, which is stabilized at a range of magnetic field of 0.3-0.6 T, is a "gas" phase and condenses into a "liquid" phase with nearly zero entropy at a critical field of 1T.