期刊
PHYSICAL REVIEW LETTERS
卷 130, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.136002
关键词
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Observing a common structural motif in several U and Ce based candidate triplet superconductors, where pairs of magnetic atoms are separated by an inversion center, we propose a unique triplet pairing mechanism based on an interplay of Hund's and Kondo interactions. Hund's interactions generate valence fluctuations, leading to a triplet superexchange between electrons and local moments. The resulting Kondo effect allows spin-triplet pairs to delocalize onto the Fermi surface, triggering superconductivity. We demonstrate this mechanism using a minimal two-channel Kondo lattice model and provide support from existing experiments.
Observing that several U and Ce based candidate triplet superconductors share a common structural motif, with pairs of magnetic atoms separated by an inversion center, we hypothesize a triplet pairing mechanism based on an interplay of Hund's and Kondo interactions that is unique to this structure. In the presence of Hund's interactions, valence fluctuations generate a triplet superexchange between electrons and local moments. The offset from the center of symmetry allows spin-triplet pairs formed by the resulting Kondo effect to delocalize onto the Fermi surface, precipitating superconductivity. We demonstrate this mechanism within a minimal two-channel Kondo lattice model and present support for this pairing mechanism from existing experiments.
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