Field-induced tuning of the pairing state in a superconductor

Abstract

The recently discovered superconductor UTe${}_2$, with a T${}_c$ between 1.5~K and 2~K, is attracting much attention due to strong suspicion of spin-triplet and topological superconductivity. Its properties under magnetic field are also remarkable, with field-reinforced and field-induced superconducting phases. Here, we report the first complete thermodynamic determination of the phase diagram for fields applied along the three crystallographic directions. Measurements were performed up to 36~T along the hard magnetisation $b$~axis in order to follow the superconducting transition up to the metamagnetic transition at $H_m=34.75$~T. They reveal the existence of a phase transition line within the superconducting phase, and drastic differences occurring between these two phases. Detailed analysis supports a different spin state between the two phases, implying a low-field spin-triplet to high-field spin-singlet transition, a unique case among superconductors, giving insight on the mechanisms leading to spin-triplet superconductivity.

Main paper : 17 pages and 15 figures, supplementary material : 17 pages and 17 figures

References in corpus (28)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unconventional Superconductivity in Heavy Fermion UTe2
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Unconventional Superconductivity in UTe2
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• Single-component superconducting state in UTe2 at 2 K
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Superconducting order parameter in UTe${}_2$ determined by Knight shift measurement
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Heavy fermions in high magnetic field
• Spatially inhomogeneous superconductivity in UTe2
• Field-angle dependence reveals odd-parity superconductivity in CeRh${}_2$As${}_2$
• Exotic multi-gap structure in UPt${}_3$ unveiled by the first-priniciples analysis
• The Fermi surface and f-valence electron count of UPt3
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• UTe${}_2$: a nearly insulating half-filled $j=\frac{5}{2}$ $5f^3$ heavy fermion metal
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Expansion of the high field-boosted superconductivity in UTe2 under pressure
• Thermodynamic signatures of short-range magnetic correlations in UTe${}_2$
• Spin triplet superconductivity driven by finite momentum spin fluctuations
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Phase diagram of UCoGe
• Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe${}_2$

Cited by in corpus (42)

• A review of UTe${}_2$ at high magnetic fields
• The fate of time-reversal symmetry breaking in UTe2
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Quantum-geometry-induced anapole superconductivity
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• de Haas-van Alphen Oscillations for the Field Along c-axis in UTe2
• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Pairing symmetries of multiple superconducting phases in UTe2: Competition between ferromagnetic and antiferromagnetic fluctuations
• Piezoelectric effect and diode effect in anapole and monopole superconductors
• Anomalous vortex dynamics in spin-triplet 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
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Theory of the low- and high-field superconducting phases of UTe${}_2$
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Anisotropic field-induced changes in the superconducting order parameter of UTe2
• Incommensurate antiferromagnetism in UTe2 under pressure
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Superconducting Order Parameters in Spin Space Groups: Methodology and Application
• Anisotropic paramagnetic response of topological Majorana surface states in the superconductor ${\text{UTe}}_2$
• Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Spectroscopic evidence of symmetry breaking in the superconducting vortices of UTe2
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Reentrant proximity-induced superconductivity for GeTe semimetal
• Field-induced superconductivity mediated by odd-parity multipole fluctuation
• 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${}_2$
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$
• Two-dimensional flat band on the (011) surface of UTe${}_2$: Implication for STM measurements with a superconducting tip
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Supercurrent-induced antiferromagnetic order and spin-triplet pair generation in quantum critical d-wave superconductors
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T
• Theoretical Study of Impurity Effects on Superconductivity in UTe2
• Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce${}_2$RhIn${}_8$
• Spin-lattice relaxation for point-node-like s-wave superconductivity in f-electron systems