Visualizing the atomic-scale origin of metallic behavior in Kondo insulators

被引:11
作者
Pirie, Harris [1 ,2 ]
Mascot, Eric [3 ]
Matt, Christian E. [1 ]
Liu, Yu [1 ]
Chen, Pengcheng [1 ]
Hamidian, M. H. [1 ]
Saha, Shanta [4 ]
Wang, Xiangfeng [4 ]
Paglione, Johnpierre [4 ]
Luke, Graeme [5 ]
Goldhaber-Gordon, David [6 ,7 ]
Hirjibehedin, Cyrus F. [8 ,9 ,10 ,14 ]
Davis, J. C. Seamus [11 ,12 ,13 ]
Morr, Dirk K. [3 ]
Hoffman, Jennifer E. [1 ]
机构
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Univ Oxford, Clarendon Lab, Oxford OX13PU, England
[3] Univ Illinois, Dept Phys, Chicago, IL 60607 USA
[4] Univ Maryland, Maryland Quantum Mat Ctr, Dept Phys, College Pk, MD 20742 USA
[5] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
[6] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[7] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA
[8] Univ Coll London UCL, London Ctr Nanotechnol, London WC1H 0AH, England
[9] UCL, Dept Phys & Astron, London WC1E 6BT, England
[10] UCL, Dept Chem, London WC1H 0AJ, England
[11] Univ Coll Cork, Dept Phys, Cork T12 R5C, Ireland
[12] Cornell Univ, Dept Phys, Lab Atom & Solid State Phys, Ithaca, NY 14850 USA
[13] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
[14] MIT, Lincoln Lab, Lexington, MA 02421 USA
基金
欧盟地平线“2020”; 加拿大自然科学与工程研究理事会; 爱尔兰科学基金会; 瑞士国家科学基金会; 欧洲研究理事会; 美国国家科学基金会;
关键词
HIDDEN-ORDER TRANSITION; FERMI-SURFACE; STATES; SMB6; SUPERCONDUCTIVITY; INSTABILITY; LATTICE; HOLES;
D O I
10.1126/science.abq5375
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A Kondo lattice is often electrically insulating at low temperatures. However, several recent experiments have detected signatures of bulk metallicity within this Kondo insulating phase. In this study, we visualized the real-space charge landscape within a Kondo lattice with atomic resolution using a scanning tunneling microscope. We discovered nanometer-scale puddles of metallic conduction electrons centered around uranium-site substitutions in the heavy-fermion compound uranium ruthenium silicide (URu2Si2) and around samarium-site defects in the topological Kondo insulator samarium hexaboride (SmB6). These defects disturbed the Kondo screening cloud, leaving behind a fingerprint of the metallic parent state. Our results suggest that the three-dimensional quantum oscillations measured in SmB6 arise from Kondo-lattice defects, although we cannot exclude other explanations. Our imaging technique could enable the development of atomic-scale charge sensors using heavy-fermion probes.
引用
收藏
页码:1214 / +
页数:5
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