Cited by 46Topological Materials and PhenomenaRare-earth and actinide compoundsSurface and Thin Film Phenomena

Robust topological surface state in Kondo insulator SmB6 thin films

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Yong, Jie, Jiang, Yeping, Usanmaz, Demet, Curtarolo, Stefano, Zhang, Xiaohang, Li, Linze, Pan, Xiaoqing, Shin, Jongmoon +2 more·2014·Applied Physics Letters

Abstract

Fabrication of smooth thin films of topological insulators with true insulating bulk are extremely important for utilizing their novel properties in quantum and spintronic devices. Here, we report the growth of crystalline thin films of SmB6, a topological Kondo insulator with true insulating bulk, by co-sputtering both SmB6 and B targets. X-ray diffraction, Raman spectroscopy, and transmission electron microscopy indicate films that are polycrystalline with a (001) preferred orientation. When cooling down, resistivity ρ shows an increase around 50 K and saturation below 10 K, consistent with the opening of the hybridization gap and surface dominated transport, respectively. The ratio ρ2K/ρ300K is only about two, much smaller than that of bulk, which indicates a much larger surface-to-bulk ratio. Point contact spectroscopy using a superconductor tip on SmB6 films shows both a Kondo Fano resonance and Andeev reflection, indicating an insulating Kondo lattice with metallic surface states.

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Research works printed but not linked: 7

  1. Cooley, J. C., Aronson, M. C., Fisk, Z. & Canfield, P. C. SmB6: Kondo insulator or exotic metal? Phys. Rev. Lett. 74, 1629 (1995).
  2. Kim, D. J. et al. Surface hall effect and nonlocal transport in SmB6. Sci. Rep. 3, 3150 (2013).
  3. Zhang, X. et al, Hybridization, Correlation, and In-Gap States in the Kondo Insulator SmB 6 Phys Rev X 3, 011011 (2013)
  4. Thomas, S. et al. Weak Antilocalization and Linear Magnetoresistance in the Surface State of SmB 6 " Preprint at http://arxiv.org/abs/1307.4133 (2013). · arXiv
  5. Nakajima, Y et al., One-dimensional edge state transport in a topological Kondo insulator. Preprint at http://arxiv.org/abs/1312.6132 (2013). · arXiv
  6. Chen, F et al, Coexistence of nontrivial two-dimensional surface state and trivial surface layer in Kondo insulator SmB 6 . Preprint at http://arxiv.org/abs/1309.2378 (2013). · arXiv
  7. Syers, P et al, Tuning bulk and surface conduction in topological Kondo insulator SmB 6 . Preprint at http://arxiv.org/abs/1408.3402 (2013). · arXiv

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Authors
Yong, J., Jiang, Y., Usanmaz, D., Curtarolo, S., Zhang, X., Li, L., Pan, X., Shin, J., Takeuchi, I., & Greene, R. L.
Affiliations
  • University of Maryland, College Park (US)
  • Duke University (US)
  • Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA
  • University of Michigan (US)
Venue
Applied Physics Letters
Published
2014-12
Volume
105
Issue
22
Pages
222403
ISSN
  • 0003-6951 (ISSN-L)
  • 1077-3118
OpenAlex
W1665510216
Cited by
46
References
41
Citations by year
2026: 1 · 2025: 2 · 2023: 1 · 2022: 1 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 7 · 2017: 7 · 2016: 7 · 2015: 6
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Applied Physics Letters (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
Funders
  • National Science Foundation (NSF) (DMR 1410665)
  • Office of Naval Research (ONR) (N00014-13-1-0635)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Rare-earth and actinide compounds
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Surface and Thin Film Phenomena
Keywords
SmB6, topological Kondo insulator, thin films, co-sputtering, hybridization gap, surface states, Andreev reflection, point-contact spectroscopy, surface-to-bulk ratio, polycrystalline films, (001) preferred orientation, Kondo lattice

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