The authors study the layered superconductor AuSn4 (Tc = 2.4 K) and reveal a two-fold symmetric angular dependence, consistent with unconventional pairing. They argue that the two-fold symmetry results from the Rashba-driven mixture of p-wave surface and s-wave bulk contributions.
- Wenliang Zhu
- Rui Song
- Qi-Kun Xue