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

Abstract

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 $\pi$ phase shift in the quantum oscillation of the critical temperature. This result verifies unconventional superconductivity of $\beta$-Bi${}_2$Pd, in accord with the expectation of a topological superconductor. We also discuss the strong indication that $\beta$-Bi${}_2$Pd is a spin-triplet superconductor.

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• Superconductivity and Fermi Surface Nesting in the Candidate Dirac Semimetal NbC
• Observation of topological electronic structure in quasi-1D superconductor TaSe3
• Spin-triplet pairing state evidenced by half-quantum flux in a noncentrosymmetric superconductor
• Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect
• Observation of a gel of quantum vortices in a superconductor at very low magnetic fields
• Superconductivity in freestanding infinite-layer nickelate membranes
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• Little-Parks like oscillations in lightly doped cuprate superconductors
• A mechanism for $\pi$ phase shifts in Little-Parks experiments: application to 4Hb-TaS${}_2$ and to 2H-TaS${}_2$ intercalated with chiral molecules
• Topological superconductor candidates PdBi${}_2$Te${}_4$ and PdBi${}_2$Te${}_5$ from a generic ab initio strategy
• Tunable quantum interferometer for correlated moiré electrons
• Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor
• Little-Parks oscillation and $\mathbf{d}$-vector texture in spin-triplet superconducting rings with bias current
• Tuning Bound States of Symmetry-Breaking Vortices via Unidirectional Charge Density Wave in a Transition-Metal Dichalcogenide Superconductor
• How spectrum-wide quantum criticality protects surface states of topological superconductors from Anderson localization: Quantum Hall plateau transitions (almost) all the way down
• Magnetic flux induced higher-order topological superconductivity
• Anomalous superconducting proximity effect of planar Pb-RhPb2 heterojunctions in the clean limit
• Theory of the Little-Parks effect in spin-triplet superconductors
• Absence of superconductivity in topological metal ScInAu${}_2$
• Half-quantum flux in spin-triplet superconducting rings with bias current
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
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• Spin-Valley Locking and Pure Spin-Triplet Superconductivity in Noncollinear Antiferromagnets Proximitized to Conventional Superconductors
• Designing edge currents using mesoscopic patterning in chiral d-wave superconductors
• Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device
• Signature of chiral superconducting order parameter evidenced in mesoscopic superconductors