Longitudinal Spin Fluctuations Driving Field-Reinforced Superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>UTe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Y. Tokunaga, H. Sakai, S. Kambe, Petr Opletal, Y. Tokiwa, Yoshinori Haga, Shunsaku Kitagawa, K. Ishida, Dai Aoki, G. Knebel, G. Lapertot, S. Krämer, M. Horvatić
Abstract
Our measurements of ^{125}Te NMR relaxations reveal an enhancement of electronic spin fluctuations above μ_{0}H^{*}∼15 T, leading to their divergence in the vicinity of the metamagnetic transition at μ_{0}H_{m}≈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.
Topics & Concepts
SuperconductivityCondensed matter physicsPairingPhase diagramPhysicsSpin (aerodynamics)Divergence (linguistics)Field (mathematics)Phase (matter)Magnetic fieldQuantum mechanicsPhilosophyThermodynamicsLinguisticsMathematicsPure mathematicsRare-earth and actinide compoundsPhysics of Superconductivity and MagnetismQuantum, superfluid, helium dynamics