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Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe$$_2$$

Tokunaga, Yo  ; Sakai, Hironori   ; Kambe, Shinsaku  ; Opletal, P.  ; Tokiwa, Yoshifumi  ; Haga, Yoshinori   ; Kitagawa, Shunsaku*; Ishida, Kenji*; Aoki, Dai*; Knebel, G.*; Lapertot, G.*; Kr$"a$mer, S.*; Horvati$'c$, M.*

Our measurements of $$^{125}$$Te NMR relaxations reveal an enhancement of electronic spin fluctuations above $$mu_0H^*sim15$$~T, leading to their divergence in the vicinity of the metamagnetic transition at $$mu_0H_mapprox35$$~T, below which field-reinforced superconductivity appears when a magnetic field ($$H$$) is applied along the crystallographic $$b$$ axis. The NMR data evidence that these fluctuations are dominantly longitudinal, providing a key to understanding the peculiar superconducting phase diagram in $$H|b$$, where such fluctuations enhance the pairing interactions.

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Category:Physics, Multidisciplinary

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