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

Abstract

Our measurements of ${}^{125}$Te NMR relaxations reveal an enhancement of electronic spin fluctuations above ${\mu }_0{H}^{\ast }\sim 15$ T, leading to their divergence in the vicinity of the metamagnetic transition at ${\mu }_0{H}_m\approx 35$ 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 $H\Vert b$, where such fluctuations enhance the pairing interactions.

7 pages, 4 figures

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Cited by in corpus (14)

• Enhanced triplet superconductivity in next generation ultraclean UTe2
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Dramatic elastic response at the critical end point in UTe${}_2$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• $b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T