Observation of Half-Quantum Flux in Unconventional Superconductor $\beta$-Bi${}_2$Pd

Yufan Li, Xiaoying Xu, C. L. Chien

We report the observation of half-integer magnetic flux quantization in mesoscopic rings of superconducting $\beta$-Bi${}_2$Pd thin films. The half-quantum fluxoid manifests itself as a…