Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe2
Abstract
Our measurements of 125Te NMR relaxations reveal an enhancement of electronic spin fluctuations above μ0H*15 T, leading to their divergence in the vicinity of the metamagnetic transition at μ0Hm≈35 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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