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Chin. Phys. B, 2022, Vol. 31(6): 067104    DOI: 10.1088/1674-1056/ac6339
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Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo2Ga8

Kangqiao Cheng(程康桥)1, Binjie Zhou(周斌杰)1, Cuixiang Wang(王翠香)2,3, Shuo Zou(邹烁)1, Yupeng Pan(潘宇鹏)1, Xiaobo He(何晓波)1, Jian Zhang(张健)1, Fangjun Lu(卢方君)1, Le Wang(王乐)4, Youguo Shi(石友国)2,3,†, and Yongkang Luo(罗永康)1,‡
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
Abstract  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 ($\varepsilon_c >0$) pushes CeCo$_2$Ga$_8$ closer to the 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.
Keywords:  heavy-fermion compounds      Kondo effect      RKKY interaction      quantum critical point  
Received:  11 February 2022      Revised:  15 February 2022      Accepted manuscript online:  01 April 2022
PACS:  71.20.Eh (Rare earth metals and alloys)  
  71.27.+a (Strongly correlated electron systems; heavy fermions)  
  71.28.+d (Narrow-band systems; intermediate-valence solids)  
Fund: Y. Shi acknowledges Beijing Natural Science Foundation, China (Grant No. Z180008) and K. C. Wong Education Foundation (Grant No. GJTD-2018-01).
Corresponding Authors:  Youguo Shi, Yongkang Luo     E-mail:  ygshi@iphy.ac.cn;mpzslyk@gmail.com

Cite this article: 

Kangqiao Cheng(程康桥), Binjie Zhou(周斌杰), Cuixiang Wang(王翠香), Shuo Zou(邹烁), Yupeng Pan(潘宇鹏), Xiaobo He(何晓波), Jian Zhang(张健), Fangjun Lu(卢方君), Le Wang(王乐), Youguo Shi(石友国), and Yongkang Luo(罗永康) Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo2Ga8 2022 Chin. Phys. B 31 067104

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