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Article Dans Une Revue Science Advances Année : 2023

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2

Katsuki Kinjo
Hiroki Matsumura
Fumiya Hori
Shunsaku Kitagawa
Kenji Ishida
Yo Tokunaga
Hironori Sakai
Shinsaku Kambe
Yusei Shimizu

Résumé

Superconducting (SC) state has spin and orbital degrees of freedom, and spin-triplet superconductivity shows multiple SC phases because of the presence of these degrees of freedom. However, the observation of spin-direction rotation occurring inside the SC state (SC spin rotation) has hardly been reported. Uranium ditelluride, a recently found topological superconductor, exhibits various SC phases under pressure: SC state at ambient pressure (SC1), high-temperature SC state above 0.5 gigapascal (SC2), and low-temperature SC state above 0.5 gigapascal (SC3). We performed nuclear magnetic resonance (NMR) and ac susceptibility measurements on a single-crystal uranium ditelluride. The b axis spin susceptibility remains unchanged in SC2, unlike in SC1, and decreases below the SC2-SC3 transition with spin modulation. These unique properties in SC3 arise from the coexistence of two SC order parameters. Our NMR results confirm spin-triplet superconductivity with SC spin parallel to b axis in SC2 and unveil the remaining of spin degrees of freedom in SC uranium ditelluride.

Dates et versions

hal-04174877 , version 1 (01-08-2023)

Identifiants

Citer

Katsuki Kinjo, Hiroki Fujibayashi, Hiroki Matsumura, Fumiya Hori, Shunsaku Kitagawa, et al.. Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2. Science Advances , 2023, 9 (30), ⟨10.1126/sciadv.adg2736⟩. ⟨hal-04174877⟩
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