125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2

Abstract

We report 125Te-NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te-NMR Knight shift K and spin-lattice relaxation rate 1/T1 for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1/T1) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate 1/T2, when the field is applied along the easy axis of magnetization (=a axis). This behavior suggests the development of longitudinal magnetic fluctuations along the a axis at very low frequencies below 20 K.

5 pages, 7 figures, accepted for publication in J. Phys. Soc. Jpn

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Cited by in corpus (16)

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• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Large Reduction in the $a$-axis Knight Shift on UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K
• Superconducting order parameter in UTe${}_2$ determined by Knight shift measurement
• 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$_2
• UTe${}_2$: a nearly insulating half-filled $j=\frac{5}{2}$ $5f^3$ heavy fermion metal
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Notes on multiple superconducting phases in UTe${}_2$ ---Third transition---
• 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${}_2$