Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe${}_2$

Abstract

Single crystals of the unconventional superconductor UTe${}_2$ have been grown in various conditions which result in different superconducting transition temperature as well as normal state properties. Stoichiometry of the samples has been characterized by the single-crystal X-ray crystallography and electron microprobe analyses. Superconducting samples are nearly stoichiometric within an experimental error of about 1 \%, while non-superconducting sample significantly deviates from the ideal composition. The superconducting UTe${}_2$ showed that the large density of states was partially gapped in the normal state, while the non-superconducting sample is characterized by the relatively large electronic specific heat as reported previously.

8 pages, 6 figures

References in corpus (9)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Low energy band structure and symmetries of UTe2 from angle resolved photoemission spectroscopy
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Spatially inhomogeneous superconductivity in UTe2
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Thermodynamic signatures of short-range magnetic correlations in UTe${}_2$

Cited by in corpus (27)

• Single-component superconducting state in UTe2 at 2 K
• Large Reduction in the $a$-axis Knight Shift on UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• A review of UTe${}_2$ at high magnetic fields
• Change of superconducting character in UTe2induced by magnetic field
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Pressure-induced structural phase transition and new superconducting phase in UTe2
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$
• Metastable phase of UTe${}_2$ formed under high pressure above 5 GPa
• Structure of the normal state and origin of Schottky anomaly in the correlated heavy fermion superconductor UTe2
• Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in 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
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
• Hydrostatic pressure studies on non-superconducting UTe2
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Ferromagnetic Crossover within the Ferromagnetic Order of U${}_7$Te${}_{12}$
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$
• $b$-axis and $c$-axis Knight shift measurements in the superconducting state on ultraclean UTe${}_2$ with $T_c$ = 2.1 K
• Electronic structure of UTe${}_2$ under pressure
• Theoretical Study of Impurity Effects on Superconductivity in UTe2