Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES

N. Xu, C. E. Matt, E. Pomjakushina, X. Shi, R. S. Dhaka, N. C. Plumb, M. Radović, P. K. Biswas, D. Evtushinsky, V. Zabolotnyy, J. H. Dil, K. Conder, J. Mesot, H. Ding, and M. Shi
Phys. Rev. B 90, 085148 – Published 28 August 2014

Abstract

Temperature dependence of the electronic structure of SmB6 is studied by high-resolution angle-resolved photoemission spectroscopy (ARPES) down to 1 K. We demonstrate that there is no essential difference for the dispersions of the surface states below and above the resistivity saturating anomaly (3.5K). Quantitative analyses of the surface states indicate that the quasiparticle scattering rate increases linearly as a function of temperature and binding energy, which differs from Fermi-liquid behavior. Most intriguingly, we observe that the hybridization between the d and f states builds gradually over a wide temperature region (30K<T<110K). The surface states appear when the hybridization starts to develop. Our detailed temperature-dependence results give a complete interpretation of the exotic resistivity result of SmB6, as well as the discrepancies among experimental results concerning the temperature regions in which the topological surface states emerge and the Kondo gap opens, and give insights into the exotic Kondo crossover and its relationship with the topological surface states in the topological Kondo insulator SmB6.

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  • Received 1 May 2014
  • Revised 14 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.085148

©2014 American Physical Society

Authors & Affiliations

N. Xu1,*, C. E. Matt1,2, E. Pomjakushina3, X. Shi1,4, R. S. Dhaka1,5,6, N. C. Plumb1, M. Radović1,7, P. K. Biswas8, D. Evtushinsky9, V. Zabolotnyy9, J. H. Dil1,5, K. Conder3, J. Mesot1,2,5, H. Ding4,10, and M. Shi1,†

  • 1Swiss Light Source, Paul Scherrer Insitut, CH-5232 Villigen PSI, Switzerland
  • 2Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland
  • 3Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 4Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5Institute of Condensed Matter Physics, École Polytechnique Fédćrale de Lausanne, CH-1015 Lausanne, Switzerland
  • 6Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
  • 7SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 8Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 9Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany
  • 10Collaborative Innovation Center of Quantum Matter, Beijing, China

  • *nan.xu@psi.ch
  • ming.shi@psi.ch

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Issue

Vol. 90, Iss. 8 — 15 August 2014

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