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We report the observation of half-integer magnetic flux quantization inmesoscopic rings of superconducting $\beta$-Bi$_2$Pd thin films. Thehalf-quantum fluxoid manifests itself as a $\pi$ phase shift in the quantumoscillation of the critical temperature. This result verifies unconventionalsuperconductivity of $\beta$-Bi$_2$Pd, in accord with the expectation of atopological superconductor. We also discuss the strong indication that$\beta$-Bi$_2$Pd is a spin-triplet superconductor.

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