期刊
CHINESE PHYSICS B
卷 31, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac6339
关键词
heavy-fermion compounds; Kondo effect; RKKY interaction; quantum critical point
资金
- Beijing Natural Science Foundation, China [Z180008]
- K. C. Wong Education Foundation [GJTD-2018-01]
This study investigates the effect of uniaxial stress on the quasi-one-dimensional Kondo lattice CeCo2Ga8. The results show that a tensile intra-chain strain enhances the quasi-one-dimensional Kondo effect, while a compressive intra-chain strain causes deviation.
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 CeCo2Ga8 by electric transport and AC heat capacity measurements. CeCo2Ga8 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 (epsilon(c) > 0) pushes CeCo2Ga8 closer to the quantum critical point, while a compressive intra-chain strain (epsilon(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.
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