论文标题
单轴压力对准二维近缘晶格Ceco $ _2 $ ga $ _8 $
Uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo$_2$Ga$_8$
论文作者
论文摘要
准二维极限中的量子关键现象仍然是一个空旷的问题。我们报告了单轴应力对准近差晶格Ceco $ _2 $ ga $ _8 $通过电动运输和交流热容量测量值的效果。 CECO $ _2 $ ga $ _8 $猜测是靠近附近，但位于量子关键点的量子排序侧。在压缩与CE-CE链平行的$ {C} $轴时，相干近藤效应的开始就会增强。相比之下，当链内距离通过沿{a}或{b}轴的压缩拉长时，电子特异性热在低温下差异更快。这些结果表明，拉伸内链菌株（$ \ varepsilon_c> 0 $）推Ceco $ _2 $ _2 $ ga $ _8 $更接近量子关键点，而压缩内部链菌株（$ \ varepsilon_c <0 $）可能会导致出发。我们的工作通过单轴应力在准-1D近距晶格中的量子临界点附近提供了罕见的操纵范式，并为在准1D限制中量子关键的独特特征提供了进一步研究的道路。
Quantum critical phenomena in the quasi-one-dimensional limit remains an open issue. We report the uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo$_2$Ga$_8$ by electric transport and AC heat capacity measurements. CeCo$_2$Ga$_8$ is speculated to sit in close vicinity but on the quantum-disordered side of a quantum critical point. Upon compressing the ${c}$ axis, parallel to the Ce-Ce chain, the onset of coherent Kondo effect is enhanced. In contrast, the electronic specific heat diverges more rapidly at low temperature when the intra-chain distance is elongated by compressions along {a} or {b} axes. These results suggest that a tensile intra-chain strain ($\varepsilon_c >0$) pushes CeCo$_2$Ga$_8$ closer to a quantum critical point, while a compressive intra-chain strain ($\varepsilon_c <0$) likely causes departure. Our work provides a rare paradigm of manipulation near a quantum critical point in a quasi-1D Kondo lattice by uniaxial stress, and paves the way for further investigations on the unique feature of quantum criticality in the quasi-1D limit.
