Quantum phase transition and destruction of Kondo effect in pressurized SmB6
Zhou, YZ; Wu, Q; Rosa, PFS; Yu, R; Guo, J; Yi, W; Zhang, S; Wang, Z; Wang, HH; Cai, S; Yang, K; Li, AG; Jiang, Z; Zhang, S; Wei, XJ; Huang, YY; Sun, PJ; Yang, YF; Fisk, Z; Si, QM; Zhao, ZX; Sun, LL
2017
发表期刊SCIENCE BULLETIN
ISSN2095-9273
卷号62期号:21页码:1439-1444
文章类型期刊论文
摘要SmB6 has been a well-known Kondo insulator for decades, but recently attracts extensive new attention as a candidate topological system. Studying SmB6 under pressure provides an opportunity to acquire the much-needed understanding about the effect of electron correlations on both the metallic surface state and bulk insulating state. Here we do so by studying the evolution of two transport gaps (low temperature gap E-l and high temperature gap E-h) associated with the Kondo effect by measuring the electrical resistivity under high pressure and low temperature (0.3 K) conditions. We associate the gaps with the bulk Kondo hybridization, and from their evolution with pressure we demonstrate an insulator-to-metal transition at similar to 4 GPa. At the transition pressure, a large change in the Hall number and a divergence tendency of the electron-electron scattering coefficient provide evidence for a destruction of the Kondo entanglement in the ground state. Our results raise the new prospect for studying topological electronic states in quantum critical materials settings. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
关键词Heavy-fermion Metals Insulator Smb6 Surface-states Resistivity Gap
DOI10.1016/j.scib.2017.10.008
关键词[WOS]HEAVY-FERMION METALS ; INSULATOR SMB6 ; SURFACE-STATES ; RESISTIVITY ; GAP
收录类别SCI
语种英语
WOS记录号WOS:000416211200005
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28788
专题中科院上海应用物理研究所2011-2018年
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GB/T 7714
Zhou, YZ,Wu, Q,Rosa, PFS,et al. Quantum phase transition and destruction of Kondo effect in pressurized SmB6[J]. SCIENCE BULLETIN,2017,62(21):1439-1444.
APA Zhou, YZ.,Wu, Q.,Rosa, PFS.,Yu, R.,Guo, J.,...&Sun, LL.(2017).Quantum phase transition and destruction of Kondo effect in pressurized SmB6.SCIENCE BULLETIN,62(21),1439-1444.
MLA Zhou, YZ,et al."Quantum phase transition and destruction of Kondo effect in pressurized SmB6".SCIENCE BULLETIN 62.21(2017):1439-1444.
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