Observation of Half-Quantum Flux in Unconventional Superconductor β-Bi2Pd
Abstract
We report the observation of half-integer magnetic flux quantization in mesoscopic rings of superconducting β-Bi2Pd thin films. The half-quantum fluxoid manifests itself as a π phase shift in the quantum oscillation of the critical temperature. This result verifies unconventional superconductivity of β-Bi2Pd, in accord with the expectation of a topological superconductor. We also discuss the strong indication that β-Bi2Pd is a spin-triplet superconductor.
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