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 (68)

• Unconventional Superconductivity in UTe2
• Detection of a Pair Density Wave State in UTe${}_2$
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• Periodic Anderson model for magnetism and superconductivity in UTe2
• Topological band and superconductivity in UTe${}_2$
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Enhanced spin triplet superconductivity due to Kondo destabilization
• 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
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• Spatially inhomogeneous superconductivity in UTe2
• Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2
• Comparison of two superconducting phases induced by a magnetic field in UTe2
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• Interplay between magnetism and superconductivity in UTe2
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Change of superconducting character in UTe2induced by magnetic field
• Field-Induced Superconductivity near the Superconducting Critical Pressure in UTe2
• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Evidence of Fermi-Surface Reconstruction at the Metamagnetic Transition of the Strongly Correlated 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
• Theory of spin-polarized superconductors -- an analogue of superfluid ${}^3$He A-phase
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• Thermodynamic signatures of short-range magnetic correlations in UTe${}_2$
• Anomalous Anisotropy of the Lower Critical Field and Meissner Effect in 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${}_2$
• Nonreciprocal Meissner response in parity-mixed superconductors
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Drastic change in magnetic anisotropy of UTe2 under pressure revealed by 125Te-NMR
• Pair Wavefunction Symmetry in UTe2 from Zero-Energy Surface State Visualization
• Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to 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${}_2$
• Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in UTe2
• Paramagnetic effects of j-electron superconductivity and application to UTe2
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• 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
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• An optical investigation of the heavy fermion normal state in superconducting UTe${}_2$
• Absence of strong magnetic fluctuations or interactions in the normal state of LaNiGa${}_2$
• 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
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice
• Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe${}_2$
• Dramatic elastic response at the critical end point in UTe${}_2$
• Quasiparticle interference and spectral function of the UTe${}_2$ superconductive surface band
• Local aging effects in PuB${}_4$: Growing inhomogeneity and slow dynamics of local-field fluctuations probed by ${}^{239}$Pu NMR
• Phenomenological theory in reentrant uranium-based superconductors
• $b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Electron-beam Floating-zone Refined UCoGe
• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA
• Electronic structure of UTe${}_2$ under pressure
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T