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.

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

References in corpus (12)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Anisotropic response of spin susceptibility in the superconducting state of UTe${}_2$ probed with ${}^{125}$Te-NMR measurement
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Direct observation of impurity-induced magnetism in an S = 1/2 antiferromagnetic Heisenberg 2-leg spin ladder
• Notes on multiple superconducting phases in UTe${}_2$ ---Third transition---
• Pressure-temperature phase diagram of ferromagnetic superconductors

Cited by in corpus (6)

• Superconducting order parameter in UTe${}_2$ determined by Knight shift measurement
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor UTe${}_2$
• Anisotropic Enhancement of Lower Critical Field in Ultraclean Crystals of Spin-Triplet Superconductor UTe2
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$