Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo2Ga8

doi:10.1088/1674-1056/ac6339

中国物理B ›› 2022, Vol. 31 ›› Issue (6): 67104-067104.doi: 10.1088/1674-1056/ac6339

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

收稿日期:2022-02-11 修回日期:2022-02-15 接受日期:2022-04-01 出版日期:2022-05-17 发布日期:2022-05-31
通讯作者: Youguo Shi, Yongkang Luo E-mail:ygshi@iphy.ac.cn;mpzslyk@gmail.com
基金资助:
Y. Shi acknowledges Beijing Natural Science Foundation, China (Grant No. Z180008) and K. C. Wong Education Foundation (Grant No. GJTD-2018-01).

Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo₂Ga₈

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

Received:2022-02-11 Revised:2022-02-15 Accepted:2022-04-01 Online:2022-05-17 Published:2022-05-31
Contact: Youguo Shi, Yongkang Luo E-mail:ygshi@iphy.ac.cn;mpzslyk@gmail.com
Supported by:
Y. Shi acknowledges Beijing Natural Science Foundation, China (Grant No. Z180008) and K. C. Wong Education Foundation (Grant No. GJTD-2018-01).

摘要/Abstract

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 ($\varepsilon_c >0$) 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.

关键词: heavy-fermion compounds, Kondo effect, RKKY interaction, quantum critical point

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.

Key words: heavy-fermion compounds, Kondo effect, RKKY interaction, quantum critical point

中图分类号: (Rare earth metals and alloys)

71.20.Eh

71.27.+a (Strongly correlated electron systems; heavy fermions) 71.28.+d (Narrow-band systems; intermediate-valence solids)

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[J]. 中国物理B, 2022, 31(6): 67104-067104.

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Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo₂Ga₈

Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo₂Ga₈

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