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125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2

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arxiv 1906.01303 v1 pith:7E44Y7UJ submitted 2019-06-04 cond-mat.str-el cond-mat.supr-con

Yo Tokunaga , Hironori Sakai , Shinsaku Kambe , Taisuke Hattori , Nonoka Higa , Genki Nakamine , Shunsaku Kitagawa , Kenji Ishida
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Ai Nakamura Yusei Shimizu Yoshiya Homma DeXin Li Fuminori Honda Dai Aoki
This is my paper · ORCID
classification cond-mat.str-elcond-mat.supr-con
keywords alongaxiscrystalte-nmrfermionheavyraterelaxation
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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.

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