Unequivocal Determination of Spin-Triplet Superconductivity Using Composite Rings
Abstract
Phase-sensitive measurements on a composite ring made of a superconductor of interest connected by a known singlet s-wave superconductor can unambiguously determine its pairing symmetry. In composite rings with epitaxial β-Bi2Pd and s-wave Nb, we have observed half-integer quantum flux when Nb is connected to the opposite crystalline ends of β-Bi2Pd and integer-quantum flux when Nb is connected to the same crystalline ends of β-Bi2Pd. These findings provide unequivocal evidence of odd-parity pairing state of the triplet superconductor β-Bi2Pd.
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