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

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arxiv 2307.10724 v2 pith:3QAJ534K submitted 2023-07-20 cond-mat.supr-con cond-mat.str-el

Yo Tokunaga , Hironori Sakai , Shinsaku Kambe , Petr Opletal , Yoshifumi Tokiwa , Yoshinori Haga , Shunsaku Kitagawa , Kenji Ishida
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Dai Aoki Georg Knebel Gerard Lapertot Steffen Krämer Mladen Horvatić
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classification cond-mat.supr-concond-mat.str-el
keywords fluctuationsfield-reinforcedlongitudinalspinsuperconductivityabovealongappears
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abstract

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 $\mu_0H_m\approx35$ 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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