Description
I will present our recent results on the layered superconductor β-PdBi$_2$, where tunneling spectroscopy under in-plane magnetic fields reveals a transition from conventional s-wave pairing to a nodal p-wave superconducting state. This sharp transition, marked by a discontinuous change in the tunneling spectra, occurs at a well-defined threshold field and originates from spin polarization and spin–momentum locking induced by locally broken inversion symmetry, which renders p-wave pairing energetically favorable at high fields. Remarkably, signatures of this transition also appear in magnetization, indicating the formation of a novel domain structure consisting of coexisting p-wave superconducting and normal regions. These findings offer a new experimental window into how spin textures, symmetry breaking, and strong spin–orbit coupling can stabilize unconventional superconductivity and generate emergent magnetic responses in layered materials.
