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  Hybridization gap and Fano resonance in SmB6

Rößler, S., Jang, T.-H., Kim, D.-J., Tjeng, L. H., Fisk, Z., Steglich, F., et al. (2014). Hybridization gap and Fano resonance in SmB6. Proceedings of the National Academy of Sciences of the United States of America, 111(13), 4798-4802. doi:10.1073/pnas.1402643111.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-B947-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-F991-3
Genre: Journal Article

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 Creators:
Rößler, S.1, Author              
Jang, Tae-Hwan2, Author              
Kim, Dae-Jeong3, Author
Tjeng, L. H.4, Author              
Fisk, Zachary3, Author
Steglich, F.5, Author              
Wirth, Steffen6, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3external, ou_persistent22              
4Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
5Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              
6Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              

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 Abstract: Hybridization between conduction electrons and the strongly interacting f-electrons in rare earth or actinide compounds may result in new states of matter. Depending on the exact location of the concomitant hybridization gap with respect to the Fermi energy, a heavy fermion or an insulating ground state ensues. To study this entanglement locally, we conducted scanning tunneling microscopy and spectroscopy (STS) measurements on the “Kondo insulator” SmB6. The vast majority of surface areas investigated were reconstructed, but infrequently, patches of varying sizes of nonreconstructed Sm- or B-terminated surfaces also were found. On the smallest patches, clear indications for the hybridization gap with logarithmic temperature dependence (as expected for a Kondo system) and for intermultiplet transitions were observed. On nonreconstructed surface areas large enough for coherent cotunneling, we were able to observe clear-cut Fano resonances. Our locally resolved STS indicated considerable finite conductance on all surfaces independent of their structure, not proving but leaving open the possibility of the existence of a topologically protected surface state.

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 Dates: 2014-04-01
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1073/pnas.1402643111
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: National Academy of Sciences
Pages: - Volume / Issue: 111 (13) Sequence Number: - Start / End Page: 4798 - 4802 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230