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Author
Kawai, T. Department of Physics, Okayama University
Wang, C. G. Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics
Kandori, Y. Department of Physics, Okayama University
Honoki, Y. Department of Physics, Okayama University
Matano, K. Department of Physics, Okayama University Kaken ID
Kambe, T. Department of Physics, Okayama University Kaken ID publons researchmap
Zheng, Guo-qing Department of Physics, Okayama University
Abstract
Topological superconductors have attracted wide-spreading interests for the bright application perspectives to quantum computing. Cu0.3Bi2Se3 is a rare bulk topological superconductor with an odd-parity wave function, but the details of the vector order parameter d and its pinning mechanism are still unclear. Here, we succeed in growing CuxBi2Se3 single crystals with unprecedented high doping levels. For samples with x = 0.28, 0.36 and 0.37 with similar carrier density as evidenced by the Knight shift, the in-plane upper critical field Hc2 shows a two-fold symmetry. However, the angle at which the Hc2 becomes minimal is different by 90° among them, which indicates that the d-vector direction is different for each crystal likely due to a different local environment. The carrier density for x = 0.46 and 0.54 increases substantially compared to x ≤ 0.37. Surprisingly, the in-plane Hc2 anisotropy disappears, indicating that the gap symmetry undergoes a transition from nematic to isotropic (possibly chiral) as carrier increases.
Published Date
2020-01-13
Publication Title
Nature Communications
Volume
volume11
Publisher
Springer Nature
Start Page
235
ISSN
2041-1723
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
© The Author(s) 2020
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DOI
Related Url
isVersionOf https://doi.org/10.1038/s41467-019-14126-w
License
http://creativecommons.org/licenses/by/4.0/
Citation
Kawai, T., Wang, C.G., Kandori, Y. et al. Direction and symmetry transition of the vector order parameter in topological superconductors CuxBi2Se3. Nat Commun 11, 235 (2020). https://doi.org/10.1038/s41467-019-14126-w