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Low-temperature magnetic fluctuations investigated by $$^{125}$$Te-NMR on the uranium-based superconductor UTe$$_2$$

Fujibayashi, Hiroki*; Kinjo, Katsuki*; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo  ; Sakai, Hironori   ; Kambe, Shinsaku  ; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; Li, D.*; Honda, Fuminori*; Aoki, Dai*

To investigate the static and dynamic magnetic properties on the uranium-based superconductor UTe$$_2$$, we measured the NMR Knight shift $$K$$ and the nuclear spin lattice relaxation rate 1/$$T_1$$ in $$H//a$$ by $$^{125}$$Te-NMR on a $$^{125}$$Te-enriched single-crystal sample. 1/$$T_1$$$$T$$ in $$H//a$$ is much smaller than 1/$$T_1$$$$T$$ in $$H //b$$ and c, and magnetic fluctuations along each axis are derived from the 1/$$T_1$$$$T$$ measured in $$H$$ parallel to all three crystalline axes. The magnetic fluctuations are almost identical at two Te sites and isotropic at high temperatures, but become anisotropic below 40 K, where heavy-fermion state is formed.

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Category:Physics, Multidisciplinary

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