1. Identify the Nematic Superconductivity of Topological Superconductor Pd$$_x$$Bi$$_2$$Te$$_3$$ by Angle-dependent Upper Critical Field Measurement
- Author
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Lingbo Cai, Qing Lu, Jianping Sun, Shugang Tan, Cao Wang, Jiayuan Hu, Qiang Jing, Chenhang Xu, Bo Liu, Xianyu Wang, Xiangqing Dong, Dong Qian, Qingyin Tian, Shu Zhu, and Fei Jiao
- Subjects
Crystal ,Physics ,Superconductivity ,Magnetic moment ,Magnetoresistance ,Liquid crystal ,Condensed Matter::Superconductivity ,Rotational symmetry ,Condensed Matter Physics ,Topology ,Single crystal ,Critical field ,Electronic, Optical and Magnetic Materials - Abstract
Odd-parity superconductivity is recognized as a key ingredient to realize topological superconductivity. In Bi2Se3-based bulk topological superconductors, the odd-parity pairing, which spontaneously breaks the threefold rotational symmetry of the crystal, leading to a subsidiary nematic order, was discovered. The nematic superconducting state can be identified by thermodynamic measurement, nuclear magnetic resonance measurement, ac- $$\chi$$ measurement, magnetic torque measurement or magnetoresistance measurement. Here, the single crystal of topological superconductor Pd $$_x$$ Bi2Te3 was grown. Its upper critical fields were obtained by magnetoresistance measurement in various magnetic field orientations parallel to the basal plane. The in-plane upper critical fields clearly demonstrate a twofold symmetry that break the threefold crystal symmetry. This provides experimental evidence that Pd-doped Bi2Te3 is a nematic topological superconductor similar to the Cu-, Sr-, and Nb-doped Bi2Se3.
- Published
- 2021