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- W3204753550 abstract "In superconductors, electrons with spin s=1/2 form Cooper pairs whose spin structure is usually singlet (S=0) or triplet (S=1). When the electronic structure near the Fermi level is characterized by fermions with angular momentum j=3/2 due to strong spin-orbit interactions, novel pairing states such as even-parity quintet (J=2) and odd-parity septet (J=3) states are allowed. Prime candidates for such exotic states are half-Heusler superconductors, which exhibit unconventional superconducting properties, but their pairing nature remains unsettled. Here, we show that the superconductivity in the noncentrosymmetric half-Heusler LuPdBi can be consistently described by the admixture of isotropic even-parity singlet and anisotropic odd-parity septet pairing, whose ratio can be tuned by electron irradiation. From magnetotransport and penetration depth measurements, we find that carrier concentrations and impurity scattering both increase with irradiation, resulting in a nonmonotonic change of the superconducting gap structure. Our findings shed new light on our fundamental understanding of unconventional superconducting states in topological materials.2 MoreReceived 23 May 2021Revised 26 August 2021Accepted 4 October 2021DOI:https://doi.org/10.1103/PhysRevX.11.041048Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFermi surfaceSpin-singlet pairingSpin-triplet pairingSuperconducting gapTopological superconductorsCondensed Matter, Materials & Applied Physics" @default.
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- W3204753550 date "2021-12-09" @default.
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- W3204753550 title "Tuning the Parity Mixing of Singlet-Septet Pairing in a Half-Heusler Superconductor" @default.
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