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Additional energy scale in SmB6 at low-temperature

Author

Listed:
  • L. Jiao

    (Max-Planck-Institute for Chemical Physics of Solids)

  • S. Rößler

    (Max-Planck-Institute for Chemical Physics of Solids)

  • D. J. Kim

    (University of California)

  • L. H. Tjeng

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Z. Fisk

    (University of California)

  • F. Steglich

    (Max-Planck-Institute for Chemical Physics of Solids
    Center for Correlated Matter, Zhejiang University
    Institute of Physics, Chinese Academy of Sciences)

  • S. Wirth

    (Max-Planck-Institute for Chemical Physics of Solids)

Abstract

Topological insulators give rise to exquisite electronic properties because of their spin-momentum locked Dirac-cone-like band structure. Recently, it has been suggested that the required opposite parities between valence and conduction band along with strong spin-orbit coupling can be realized in correlated materials. Particularly, SmB6 has been proposed as candidate material for a topological Kondo insulator. Here we observe, by utilizing scanning tunnelling microscopy and spectroscopy down to 0.35 K, several states within the hybridization gap of about ±20 meV on well characterized (001) surfaces of SmB6. The spectroscopic response to impurities and magnetic fields allows to distinguish between dominating bulk and surface contributions to these states. The surface contributions develop particularly strongly below about 7 K, which can be understood in terms of a suppressed Kondo effect at the surface. Our high-resolution data provide insight into the electronic structure of SmB6, which reconciles many current discrepancies on this compound.

Suggested Citation

  • L. Jiao & S. Rößler & D. J. Kim & L. H. Tjeng & Z. Fisk & F. Steglich & S. Wirth, 2016. "Additional energy scale in SmB6 at low-temperature," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13762
    DOI: 10.1038/ncomms13762
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    Cited by:

    1. Younsik Kim & Min-Seok Kim & Dongwook Kim & Minjae Kim & Minsoo Kim & Cheng-Maw Cheng & Joonyoung Choi & Saegyeol Jung & Donghui Lu & Jong Hyuk Kim & Soohyun Cho & Dongjoon Song & Dongjin Oh & Li Yu &, 2023. "Kondo interaction in FeTe and its potential role in the magnetic order," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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