Signatures of tunable magnetic-field-induced superconductivity and their large Pauli violation in hexalayer rhombohedral graphene

Rhombohedral multilayer graphene systems have emerged as a unique platform to host multiple unconventional superconducting behaviors. Here, we report signatures of in-plane magnetic fields induced superconductivity in hexalayer rhombohedral graphene near a symmetry-breaking transition. The onset and critical magnetic field for the field-induced superconductivity can be continuously tuned by electric fields with a critical magnetic field maxima > 14 T which is far beyond the Pauli limit. Fermiology analysis reveals that these superconducting states derived from the Lifshitz transition at the symmetry breaking phase boundary. The experimental results suggest a highly unconventional superconductivity behavior in hexalayer rhombohedral graphene that possibly possesses a spin-triplet order parameter.