Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$

Abstract

${}^{125}$Te NMR experiments in field ($H$) applied along the easy magnetization axis (the $a$-axis) revealed slow electronic dynamics developing in the paramagnetic state of UTe${}_2$. The observed slow fluctuations are concerned with a successive growth of long-range electronic correlations below 30$-$40 K, where the spin susceptibility along the hard magnetization axis (the $b$-axis) shows a broad maximum. The experiments also imply that tiny amounts of disorder or defects locally disturb the long-range electronic correlations and develop an inhomogeneous electronic state at low temperatures, leading to a low temperature upturn observed in the bulk-susceptibility in $H\Vert a$. We suggest that UTe${}_2$ would be located on the paramagnetic side near an electronic phase boundary, where either magnetic or Fermi-surface instability would be the origin of the characteristic fluctuations.

arXiv comment5 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn

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• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting UTe2
• Microscopic imaging homogeneous and single phase superfluid density in UTe${}_2$
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Possible Coexistence of Antiferromagnetic and Ferromagnetic Spin Fluctuations in the Spin-triplet Superconductor UTe2 Revealed by 125Te NMR under Pressure
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Structure of the normal state and origin of Schottky anomaly in the correlated heavy fermion superconductor UTe2
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor UTe${}_2$
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Anisotropic Enhancement of Lower Critical Field in Ultraclean Crystals of Spin-Triplet Superconductor UTe2
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor 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
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Dramatic elastic response at the critical end point in UTe${}_2$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Magnetic edge fields in UTe${}_2$ near zero background fields
• $b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K