Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe
Tokunaga, Yo
; Sakai, Hironori
; Kambe, Shinsaku
; Opletal, P.
; Tokiwa, Yoshifumi
; Haga, Yoshinori
; Kitagawa, Shunsaku*; Ishida, Kenji*; Aoki, Dai*; Knebel, G.*; Lapertot, G.*; Kr
mer, S.*; Horvati
, M.*
Our measurements of
Te NMR relaxations reveal an enhancement of electronic spin fluctuations above
~T, leading to their divergence in the vicinity of the metamagnetic transition at
~T, below which field-reinforced superconductivity appears when a magnetic field (
) is applied along the crystallographic
axis. The NMR data evidence that these fluctuations are dominantly longitudinal, providing a key to understanding the peculiar superconducting phase diagram in
, where such fluctuations enhance the pairing interactions.