$b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K

Abstract

Knight shifts along the $b$ and $c$ axes ($K_b$ and $K_c$) at two crystallographically distinct Te sites were measured down to 70 mK using ${}^{125}$Te nuclear magnetic resonance (NMR) on an ultraclean UTe${}_2$ single crystal with a superconducting (SC) transition temperature $T_{\mathrm{c}}$ = 2.1 K. This was carried out to determine the $\mathbf{d}$-vector components, which are the order parameter in the spin-triplet pairing. Although the decrease in $K_b$ and $K_c$ is comparable to the theoretical estimation of the SC diamagnetic shielding effect, it is confirmed, by taking the difference between two Knight shifts at the distinct Te sites, that the spin susceptibility along the $b$ and $c$ axes decreases in the SC state. Taking into account the large decrease in $K_a$ in the SC state, we conclude that the $\mathbf{d}$ vector has components along all three crystal axes.

arXiv comment8 pages, 7 figures

References in corpus (32)

• Spontaneously polarized half-gapped superconductivity
• The Order Parameter for the Superconducting Phases of UPt${}_3$
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Unconventional Superconductivity in UTe2
• Multiple superconducting phases in a nearly ferromagnetic system
• Scaling in the Emergent Behavior of Heavy Electron Materials
• 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
• Superconducting Properties of Heavy Fermion UTe${}_2$ Revealed by ${}^{125}$Te-Nuclear Magnetic Resonance
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• 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
• A review of UTe${}_2$ at high magnetic fields
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• Change of superconducting character in UTe2induced by magnetic field
• Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe${}_2$
• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases 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${}_2$
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Drastic change in magnetic anisotropy of UTe2 under pressure revealed by 125Te-NMR
• Paramagnetic effects of j-electron superconductivity and application to UTe2
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor UTe${}_2$
• 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 Enhancement of Lower Critical Field in Ultraclean Crystals of Spin-Triplet Superconductor UTe2
• Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe${}_2$
• Hydrostatic pressure studies on non-superconducting UTe2
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR

Cited by in corpus (1)

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