Superconducting Properties of Heavy Fermion UTe${}_2$ Revealed by ${}^{125}$Te-Nuclear Magnetic Resonance

Abstract

We have performed the ${}^{125}$Te-nuclear magnetic resonance (NMR) measurement in the field along the $b$ axis on the newly discovered superconductor UTe${}_2$, which is a candidate of a spin-triplet superconductor. The nuclear spin-lattice relaxation rate divided by temperature $1/T_{1}T$ abruptly decreases below a superconducting (SC) transition temperature $T_c$ without showing a coherence peak, indicative of UTe${}_2$ being an unconventional superconductor. It was found that the temperature dependence of $1/T_{1}T$ in the SC state cannot be understood by a single SC gap behavior but can be explained by a two SC gap model. The Knight shift, proportional to the spin susceptibility, decreases below $T_c$, but the magnitude of the decrease is much smaller than the decrease expected in the spin-singlet pairing. Rather, the small Knight-shift decrease as well as the absence of the Pauli-depairing effect can be interpreted by the spin triplet scenario.

10 pages, 8 figures, including supplemental materials, chosen as Editors' choice, open access

References in corpus (7)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Unconventional Superconductivity in Heavy Fermion UTe2
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Evidence of Andreev bound states as a hallmark of the FFLO phase in $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Electronic Structure of UTe${}_2$ Studied by Photoelectron Spectroscopy
• Magnetic and superconducting properties on S-type single-crystal CeCu${}_2$Si${}_2$ probed by ${}^{63}$Cu nuclear magnetic resonance and nuclear quadrupole resonance

Cited by in corpus (86)

• Unconventional Superconductivity in UTe2
• Detection of a Pair Density Wave State in UTe${}_2$
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate valence UTe2
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• Single-component superconducting state in UTe2 at 2 K
• 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${}_2$
• Magnetic-field sensitive charge density wave orders in the superconducting phase of UTe2
• 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
• Anomalous normal fluid response in a chiral superconductor UTe2
• Anisotropic response of spin susceptibility in the superconducting state of UTe${}_2$ probed with ${}^{125}$Te-NMR measurement
• 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
• Tuning magnetic confinement of spin-triplet superconductivity
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• A review of UTe${}_2$ at high magnetic fields
• Revealing a 3D Fermi Surface Pocket and Electron-Hole Tunneling in UTe${}_2$ with Quantum Oscillations
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• 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
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting 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$_2
• Parity transition of spin-singlet superconductivity using sub-lattice degrees of freedom
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Microscopic imaging homogeneous and single phase superfluid density in 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${}_2$
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$
• Expansion of the high field-boosted superconductivity in UTe2 under pressure
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• 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${}_2$
• Advances in actinide thin films: synthesis, properties, and future directions
• Possible Realization of Topological Crystalline Superconductivity with Time-Reversal Symmetry in UTe2
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Pair Wavefunction Symmetry in UTe2 from Zero-Energy Surface State Visualization
• Multiple superconducting phases in heavy-fermion metals
• Drastic change in magnetic anisotropy of UTe2 under pressure revealed by 125Te-NMR
• Chemical Principles of Intrinsic Topological Superconductors
• Metastable phase of UTe${}_2$ formed under high pressure above 5 GPa
• Inhomogeneous high temperature melting and decoupling of charge density waves in spin-triplet superconductor UTe2
• Paramagnetic effects of j-electron superconductivity and application to UTe2
• Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in UTe2
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• Notes on multiple superconducting phases in UTe${}_2$ ---Third transition---
• Topological Anomalous Skin Effect in Weyl Superconductors
• 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
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• Time-Reversal Symmetry and the Structure of Superconducting Order Parameter of Nearly Ferromagnetic Spin-Triplet Superconductor UTe2
• Theory of the low- and high-field superconducting phases of UTe${}_2$
• Origin of the non-Fermi-liquid behavior in CeRh2As2
• Observation of odd-parity superconductivity in UTe2
• Intrinsic Anomalous Thermal Hall Effect in the Unconventional Superconductor UTe2
• Anisotropic field-induced changes in the superconducting order parameter of UTe2
• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
• An optical investigation of the heavy fermion normal state in superconducting UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Nodal superconducting gap structure and topological surface states of UTe${}_2$
• 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
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
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• Quasiparticle interference and spectral function of the UTe${}_2$ superconductive surface band
• Majorana multipole response with magnetic point group symmetry
• Higher-order topological phases for time-reversal-symmetry breaking superconductivity in UTe${}_2$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Phenomenological theory in reentrant uranium-based superconductors
• 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
• Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice
• Nodal Superconductivity of UTe${}_2$ Probed by Field-Angle-Resolved Specific Heat on a Crystal with $T_{\mathrm{c}}=2.1$ K
• Nuclear spin relaxation rate of nonunitary Dirac and Weyl superconductors
• Spin-lattice relaxation for point-node-like s-wave superconductivity in f-electron systems
• Quasiparticle Interference of Spin-Triplet Superconductors: Application to UTe${}_2$