Year: 2019
Type: article
Abstract: We report 125Te-NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te-NMR Knight shift K and spin-lattice relaxation rate 1/T1 for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1/T1) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1/T2, when the field is applied along the easy axis of magnetization (=a axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a axis at very low frequencies below 20 K.
Authors: Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Taisuke Hattori, Nonoka Higa, Genki Nakamine, Shunsaku Kitagawa, Kenji Ishida, 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: green
Awards: G1625082361, G1709501864, Investigation of exotic quantum phenomena on strongly correlated electron materials without inversion symmetry in their crystal structures under ultra high pressure, G2369834278, G260769318, 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), Novel physical properties in 5f electron systems opened up by inversion-symmetry breaking and Fermiology, 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, G7592164327, NMR study of superconducting state near upper critical field
OpenAlex ID: W2948056134