Anisotropic response of spin susceptibility in the superconducting state of UTe${}_2$ probed with ${}^{125}$Te-NMR measurement

Abstract

To investigate spin susceptibility in a superconducting (SC) state, we measured the ${}^{125}$Te-nuclear magnetic resonance (NMR) Knight shifts at magnetic fields ($H$) up to 6.5 T along the $b$ and $c$ axes of single-crystal UTe${}_2$, a promising candidate for a spin-triplet superconductor. In the SC state, the Knight shifts along the $b$ and $c$ axes ($K_b$ and $K_c$, respectively) decreased slightly and the decrease in $K_b$ was almost constant up to 6.5 T. The reduction in $K_c$ decreased with increasing $H$, and $K_c$ was unchanged through the SC transition temperature at 5.5 T, excluding the possibility of spin-singlet pairing. Our results indicate that spin susceptibilities along the $b$ and $c$ axes slightly decrease in the SC state in low $H$, and the $H$ response of SC spin susceptibility is anisotropic in the $bc$ plane. We discuss the possible $d$-vector state within the spin-triplet scenario and suggest that the dominant $d$-vector component for the case of $H\parallel b$ changes above 13 T, where $T_{\mathrm{c}}$ increases with increasing $H$.

7 pages, 7 figures, including supplemental materials, to appear in Phys. Rev. B

References in corpus (6)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• 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
• Weyl Superconductivity in UTe2
• Spin-triplet superconductivity in the paramagnetic UCoGe under pressure studied by ${}^{59}$Co NMR

Cited by in corpus (44)

• Unconventional Superconductivity in UTe2
• First Observation of de Haas-van Alphen Effect and Fermi Surfaces in Unconventional Superconductor UTe2
• Resonance from antiferromagnetic spin fluctuations for superconductivity in 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
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• 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
• Interplay between magnetism and superconductivity in UTe2
• 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 Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Microscopic imaging homogeneous and single phase superfluid density in UTe${}_2$
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Expansion of the high field-boosted superconductivity in UTe2 under pressure
• 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
• Drastic change in magnetic anisotropy of UTe2 under pressure revealed by 125Te-NMR
• Multiple superconducting phases in heavy-fermion metals
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor UTe${}_2$
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• Anisotropic field-induced changes in the superconducting order parameter of UTe2
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Spectroscopic evidence of symmetry breaking in the superconducting vortices of UTe2
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Dramatic elastic response at the critical end point in UTe${}_2$
• Magnetic edge fields in UTe${}_2$ near zero background fields
• 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
• Magnetic Field Dependence of the Spin Susceptibility on Conventional s-wave Superconductor LaRu${}_4$P${}_{12}$ Revealed by ${}^{31}$P-NMR and ${}^{139}$La-NMR