Uniaxial stress tuning of geometrical frustration in a Kondo lattice
Uniaxial stress tuning of geometrical frustration in a Kondo lattice
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DOI：
10.1103/physrevb.96.241110
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发表时间：
2017-12
影响因子：
3.7
通讯作者：
R. Kuechler;C. Stingl;Y. Tokiwa;M. Kim;T. Takabatake;P. Gegenwart
中科院分区：
文献类型：
--
作者：
R. Kuechler;C. Stingl;Y. Tokiwa;M. Kim;T. Takabatake;P. Gegenwart
在扭曲kagome晶格上具有顺磁$4f$矩的六角形CeRhSn显示出与几何挫折相关的零场量子临界行为。我们报告了在多极端条件下的高分辨率热膨胀和磁致伸缩测量，如单轴应力高达200 MPa，温度低至0.1 K，磁场高达10 T。在沿$a$方向的单轴应力下，量子临界性消失，复杂的磁相图出现，相序列低于1.2 K，场在0到3 T之间（$\ensuremath{\parallel}a$）。由于Kondo耦合随着应力的增加而增加，这将稳定CeRhSn中的顺磁行为，因此观察到的顺序是由平面内应力释放几何挫折引起的。
Hexagonal CeRhSn with paramagnetic $4f$ moments on a distorted kagome lattice displays zero-field quantum critical behavior related to geometrical frustration. We report high-resolution thermal expansion and magnetostriction measurements under multiextreme conditions such as uniaxial stress up to 200 MPa, temperatures down to 0.1 K, and magnetic fields up to 10 T. Under uniaxial stress along the $a$ direction, quantum criticality disappears and a complex magnetic phase diagram arises with a sequence of phases below 1.2 K and fields between 0 and 3 T ($\ensuremath{\parallel}a$). Since the Kondo coupling increases with stress, which alone would stabilize paramagnetic behavior in CeRhSn, the observed order arises from the release of geometrical frustration by in-plane stress.