Superconducting order parameter in UTe${}_2$ determined by Knight shift measurement

Abstract

This study investigates the spin susceptibility in U-based superconductor UTe${}_2$ in the superconducting (SC) state by using Knight shift measurements for a magnetic field $H$ along the $a$ axis, which is the magnetic easy axis of UTe${}_2$. Although a tiny anomaly ascribed to the SC diamagnetic effect was observed just below the SC transition temperature $T_{\mathrm{c}}$, the $a$-axis Knight shift in the SC state shows no significant decrease, following the extrapolation from the normal-state temperature dependence. This indicates that the spin susceptibility is nearly unchanged below $T_{\mathrm{c}}$. Considering the previous Knight shift results for $H\parallel b$ and $H\parallel c$, the dominant SC state is determined to be $B_{3u}$ in the spin-triplet pairing, which is consistent with the spin anisotropy in the normal state. The present result shows that UTe${}_2$ is a spin-triplet superconductor with spin degrees of freedom.

arXiv comment6 pages, 8 figures

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Cited by in corpus (47)

• Large Reduction in the $a$-axis Knight Shift on UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K
• Field-induced tuning of the pairing state in a superconductor
• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• Single-Component Superconductivity in UTe${}_2$ at Ambient Pressure
• 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${}_2$
• Change of superconducting character in UTe2induced by magnetic field
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting UTe2
• Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh${}_2$As${}_2$
• Parity transition of spin-singlet superconductivity using sub-lattice degrees of freedom
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Microscopic imaging homogeneous and single phase superfluid density in UTe${}_2$
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity 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${}_2$
• Possible Realization of Topological Crystalline Superconductivity with Time-Reversal Symmetry in UTe2
• Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Pair Wavefunction Symmetry in UTe2 from Zero-Energy Surface State Visualization
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• 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
• Observation of odd-parity superconductivity in UTe2
• Anisotropic field-induced changes in the superconducting order parameter of UTe2
• Appearance of $c$-axis magnetic moment in odd-parity antiferromagnetic state in CeRh${}_2$As${}_2$ revealed by ${}^{75}$As-NMR
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in 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
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Thermal conductivity of nonunitary triplet superconductors: application to UTe${}_2$
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$
• Quasiparticle interference and spectral function of the UTe${}_2$ superconductive surface band
• Microscopic theory of pair density waves in spin-orbit coupled Kondo lattice
• Two-dimensional flat band on the (011) surface of UTe${}_2$: Implication for STM measurements with a superconducting tip
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Spin susceptibility of nonunitary spin-triplet superconductors
• $b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K
• Nodal Superconductivity of UTe${}_2$ Probed by Field-Angle-Resolved Specific Heat on a Crystal with $T_{\mathrm{c}}=2.1$ K
• A unified theoretical framework for Kondo superconductors: Periodic Anderson impurities with attractive pairing and Rashba spin-orbit coupling
• Visualizing the Odd-parity Superconducting Order Parameter and its Quasiparticle Surface Band in UTe2
• Superconducting Properties on Two-dimensional Quasicrystal (Ta${}_{0.95}$Cu${}_{0.05}$)${}_{1.6}$Te Studied with ${}^{125}$Te-NMR