呼吸烧绿石磁体LiACr $_4$ X $_8$（A = Ga，In，X = O，S）的热膨胀和体积磁致伸缩
Thermal Expansion and Volume Magnetostriction in Breathing Pyrochlore Magnets LiACr$_4$X$_8$ (A = Ga, In, X = O, S)
摘要：
本文报道了呼吸烧绿石磁体LiACr $_4$ X $_8$（A = Ga，In，X = O，S）的热膨胀和磁致伸缩。所有这四个化合物显示出大的体积收缩与反铁磁秩序随着温度的降低。在Neél温度以上，LiGaCr 4S 8显示负的热膨胀，LiInCr 4 O 8显示正的热膨胀，并具有向下凹的温度依赖性，而LiInCr 4S 8显示正的受迫体积磁致伸缩。这些现象很可能是由具有J和J '的呼吸烧绿石结构内部复杂的结构-磁性相关引起的。这些结果表明，呼吸烧绿石磁体是有前途的实现各种体积的现象，它们的磁性不仅在磁有序相，但也在顺磁相。
英文摘要：
We report thermal expansion and magnetostriction in breathing pyrochlore magnets LiACr$_4$X$_8$ (A = Ga, In, X = O, S) measured by a dilatometric method on sintered samples. All four of these compounds showed a large volume contraction associated with antiferromagnetic order with decreasing temperature. Above the Neél temperature, LiGaCr4S8 showed negative thermal expansion, LiInCr4O8 showed positive thermal expansion with concave-downward temperature dependence, and LiInCr4S8 showed positive forced volume magnetostriction. All these phenomena are likely caused by the complex structure-magnetism correlation within the breathing pyrochlore structure with J and J'. These results suggested that breathing pyrochlore magnets are promising for the realization of various volumetric phenomena related to their magnetism not only in the magnetically-ordered phase but also in the paramagnetic phase.
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