Experimental studies of the topological superconductor CuxBi2Se3

10th International Conference on Materials and Mechanisms of Superconductivity

Ando, Yoichi^1 ; Segawa, Kouji^1 ; Sasaki, Satoshi^1 ; Kriener, M.^1

Institute of Scientific and Industrial Research, Osaka University, Ibaraki Osaka 567-0047, Japan^1

关键词: Effective mass;    Majorana;    Normal state resistivity;    Point contact spectroscopy;    Quasi-particle state;    Scattering rates;    Time reversal;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012033/pdf
DOI  :  10.1088/1742-6596/449/1/012033

来源: IOP

【 摘 要 】

CuxBi2Se3 was recently elucidated to be the first example of a time-reversal-invariant topological superconductor characterized by the gapless surface quasiparticle states consisting of helical Majorana fermions. The evidence for topological superconductivity in CuxBi2Se3 was obtained by the point-contact spectroscopy that indirectly detected the itinerant massless Majorana state on the surface. In this paper, we show new point-contact spectroscopy data which supplement the previous conclusion. We also present the anisotropic normal-state resistivity data for superconducting samples of CuxBi2Se3 which strongly suggest that not only the effective mass but also the scattering rate is anisotropic in this material by a factor of ∼3.