Enhanced triplet superconductivity in next generation ultraclean UTe2

Abstract

The unconventional superconductor UTe${}_2$ exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected against decoherence. UTe${}_2$ possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, a metamagnetic transition to a field-polarised state, along with pair- and charge-density wave orders. However, contradictory reports between studies performed on UTe${}_2$ specimens of varying quality have severely impeded theoretical efforts to understand the microscopic origins of the exotic superconductivity. Here, we report a comprehensive suite of high magnetic field measurements on a new generation of pristine quality UTe${}_2$ crystals. Our experiments reveal a significantly revised high magnetic field superconducting phase diagram in the ultraclean limit, showing a pronounced sensitivity of field-induced superconductivity to the presence of crystalline disorder. We employ a Ginzburg-Landau model that excellently captures this acute dependence on sample quality. Our results suggest that in close proximity to a field--induced metamagnetic transition the enhanced role of magnetic fluctuations -- that are strongly suppressed by disorder -- is likely responsible for tuning UTe${}_2$ between two distinct spin-triplet superconducting phases.

References in corpus (55)

• Spontaneously polarized half-gapped superconductivity
• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• The Challenge of Unconventional Superconductivity
• Spontaneous Magnon Decays
• Unconventional Superconductivity in Heavy Fermion UTe2
• Unconventional Superconductivity
• Extreme magnetic field-boosted superconductivity
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• Unconventional Superconductivity in UTe2
• Field-reentrant superconductivity close to a metamagnetic transition in the heavy-fermion superconductor UTe${}_2$
• Respective influences of pair breaking and phase fluctuations in disordered high Tc superconductors
• Detection of a Pair Density Wave State in UTe${}_2$
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• 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
• Single-component superconducting state in UTe2 at 2 K
• First Observation of de Haas-van Alphen Effect and Fermi Surfaces in Unconventional Superconductor UTe2
• Topological band and superconductivity in UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Magnetic-field sensitive charge density wave orders in the superconducting phase of UTe2
• 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
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Spatially inhomogeneous superconductivity in UTe2
• Comparison of two superconducting phases induced by a magnetic field in UTe2
• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• Tuning magnetic confinement of spin-triplet superconductivity
• A review of UTe${}_2$ at high magnetic fields
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• Field-induced decay dynamics in square-lattice antiferromagnet
• Change of superconducting character in UTe2induced by magnetic field
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe${}_2$
• Triplet pairing mechanisms from Hund's-Kondo models: applications to UTe${}_2$ and CeRh${}_2$As${}_2$
• Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting UTe2
• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• Reentrant superconductivity in URhGe
• Quantum interference between quasi-2D Fermi surface sheets in UTe2
• 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${}_2$
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Possible Realization of Topological Crystalline Superconductivity with Time-Reversal Symmetry in UTe2
• Chiral Superconductivity in UTe${}_2$ via Emergent $C_4$ Symmetry and Spin Orbit Coupling
• Reentrant superconductivity in UTe${}_2$
• Anisotropic Enhancement of Lower Critical Field in Ultraclean Crystals of Spin-Triplet Superconductor UTe2
• Stability of a Nonunitary Triplet Pairing on the Border of Magnetism in UTe${}_2$
• Theory of the low- and high-field superconducting phases of UTe${}_2$
• On Sharp Enhancement of Effective Mass of Quasiparticles and Coefficient of T^{2} Term of Resistivity around First-Order Metamagnetic Transition Observed in UTe_{2}
• Metamagnetic phase transition in ferromagnetic superconductor URhGe
• Composition dependence of bulk superconductivity in YFe2Ge2
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe${}_2$

Cited by in corpus (19)

• Crossed Andreev reflection in collinear $p$-wave magnet/triplet superconductor junctions
• Superconducting Diode Effect in Multiphase Superconductors
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• The Fermi surface of RuO2 measured by quantum oscillations
• A quantum critical line bounds the high field metamagnetic transition surface in 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
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets in UTe${}_2$
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• UTe${}_2$: a narrow band superconductor
• Dramatic elastic response at the critical end point in UTe${}_2$
• Two-dimensional flat band on the (011) surface of UTe${}_2$: Implication for STM measurements with a superconducting tip
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Revealing isotropic abundant low-energy excitations in UTe${}_2$ through complex microwave surface impedance
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• Evidence of intertwined pair density and charge density wave orders in UTe2
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T
• Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry
• Reentrant Superconductivity from Competing Spin-Triplet Instabilities