Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo_(2)Ga_(8)  

作　　者：Kangqiao Cheng Binjie Zhou Cuixiang Wang Shuo Zou Yupeng Pan Xiaobo He Jian Zhang Fangjun Lu Le Wang Youguo Shi Yongkang Luo 程康桥;周斌杰;王翠香;邹烁;潘宇鹏;何晓波;张健;卢方君;王乐;石友国;罗永康(Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Shenzhen Institute for Quantum Science and Engineering,and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [4]Shenzhen Institute for Quantum Science and Engineering,and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Chinese Physics B》2022年第6期104-108,共5页中国物理B（英文版）

基　　金：Y.Shi acknowledges Beijing Natural Science Foundation,China(Grant No.Z180008);K.C.Wong Education Foundation(Grant No.GJTD-2018-01).

摘　　要：Quantum critical phenomena in the quasi-one-dimensional limit remain 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 axis.These results suggest that a tensile intra-chain strain(ε_(c)>0)pushes CeCo_(2)Ga_(8) closer to the quantum critical point,while a compressive intra-chain strain(ε_(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.

关 键 词：heavy-fermion compounds Kondo effect RKKY interaction quantum critical point 

分 类 号：O469[理学—凝聚态物理]