Observation of a liquid-gas-type transition in the pyrochlore spin ice compound Dy2Ti2O7 in a magnetic field.
Observation of a liquid-gas-type transition in the pyrochlore spin ice compound Dy2Ti2O7 in a magnetic field.
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磁场中烧绿石自旋冰化合物 Dy2Ti2O7 液-气型转变的观察。
DOI：
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发表时间：
2003
影响因子：
8.6
通讯作者：
S. Takagi
中科院分区：
文献类型：
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作者：
T. Sakakibara;T. Tayama;Z. Hiroi;K. Matsuhira;S. Takagi
对烧绿石自旋冰化合物Dy_2Ti_2O_7的低温磁化强度测量表明，在H = 0.9T时，平行于[111]方向出现的冰规则打破自旋翻转转变为T<0.36K时的一级相变，该相变很可能是液-气型的.在低至0.03 K时观察到的临界场的T-线性变化表明了一种不寻常的情况，即当T->0时，穿过跃迁的熵释放仍然是有限的[约为0.5（J/K）x mol-Dy]，这与中间“kagomé冰”态的宏观简并性的破坏相一致。
Low temperature magnetization measurements on the pyrochlore spin ice compound Dy2Ti2O7 reveal that the ice-rule breaking spin flip, appearing at H approximately 0.9 T applied parallel to the [111] direction, turns into a novel first-order transition for T<0.36 K which is most probably of a liquid-gas type. T-linear variation of the critical field observed down to 0.03 K suggests the unusual situation that the entropy release across the transition remains finite [approximately 0.5 (J/K) x mol-Dy] as T-->0, in accordance with a breaking of the macroscopic degeneracy in the intermediate "kagomé ice" state.