Superconducting Properties of Heavy Fermion UTe2 Revealed by 125Te-nuclear Magnetic Resonance
Year: 2019
Type: article
Abstract: We have performed the $^{125}$Te-nuclear magnetic resonance (NMR) measurement in the field along the $b$ axis on the newly discovered superconductor UTe$_2$, which is a candidate of a spin-triplet superconductor. The nuclear spin-lattice relaxation rate divided by temperature $1/T_1T$ abruptly decreases below a superconducting (SC) transition temperature $T_c$ without showing a coherence peak, indicative of UTe$_2$ being an unconventional superconductor. It was found that the temperature dependence of $1/T_1T$ in the SC state cannot be understood by a single SC gap behavior but can be explained by a two SC gap model. The Knight shift, proportional to the spin susceptibility, decreases below $T_c$, but the magnitude of the decrease is much smaller than the decrease expected in the spin-singlet pairing. Rather, the small Knight-shift decrease as well as the absence of the Pauli-depairing effect can be interpreted by the spin triplet scenario.
Authors: Genki Nakamine, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1625082361, G1709501864, G2369834278, G260769318, G2775412299, Spatially inversion broken phase transition and spin-triplet superconductivity on Cd2Re2O7, Understanding of the Mechanism of Superconductivity and Search for a Novel Superconducting State in Uranium Heavy-Fermion Compounds, Microscopic study of electronic state for uranium chalcogenide in the whole range of magnetic field(Fostering Joint International Research), スピン三重項状態を持つ強磁性超伝導体のトポロジカル物性とフェルミ面, Study of superconducting symmetry and magnetic response in the uranium exotic superconductors using high-quality single crystals, G6752906418, G6770061744, G7137355662, Microscopic investigation of ferromagnetic superconductivity under uniaxial stress, NMR study of superconducting state near upper critical field
OpenAlex ID: W2981131718