Direction and symmetry transition of the vector order parameter in topological superconductors CuxBi2Se3

T. Kawai, C. G. Wang, Y. Kandori, Y. Honoki, K. Matano, T. Kambe and Guo-qing Zheng ()
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T. Kawai: Okayama University
C. G. Wang: Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics
Y. Kandori: Okayama University
Y. Honoki: Okayama University
K. Matano: Okayama University
T. Kambe: Okayama University
Guo-qing Zheng: Okayama University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-019-14126-w

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