Interplay between magnetism and superconductivity in UTe2

Abstract

Time-reversal symmetry breaking (TRSB) in UTe2 was inferred from observations of a spontaneous Kerr response in the superconducting state after cooling in zero magnetic field, while a finite c-axis magnetic field training was further used to determine the nature of the non-unitary composite order-parameter of this material. Here we present an extensive study of the magnetic-field-trained Kerr effect, which unveils a unique critical state of pinned ferromagnetic vortices. We show that a remanent Kerr signal that appears following the removal of a training magnetic field, which reflects the response of the TRSB order parameter and the external magnetic field through the paramagnetic susceptibility. This unambiguously demonstrate the importance of the ferromagnetic fluctuations and their intimate relation to the composite order parameter. Focusing the measurement to the center of the sample, we are able to accurately determine the maximum field that is screened by the critical state and the respective critical current. Measurements in the presence of magnetic field show the tendency of the superconductor to produce shielding currents that oppose the increase in vortex-induced magnetization due to the diverging paramagnetic susceptibility.

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Cited by in corpus (27)

• Unconventional Superconductivity in UTe2
• High Resolution Polar Kerr Effect Studies of CsV${}_3$Sb${}_5$: Tests for Time Reversal Symmetry Breaking Below the Charge Order Transition
• 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
• The fate of time-reversal symmetry breaking in UTe2
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting UTe2
• Microscopic imaging homogeneous and single phase superfluid density in UTe${}_2$
• Ubiquitous Spin Freezing in the Superconducting State 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${}_2$
• Thermodynamic and electrical transport properties of UTe${}_2$ under uniaxial stress
• Chiral Superconductivity in UTe${}_2$ via Emergent $C_4$ Symmetry and Spin Orbit Coupling
• Identifying f-electron symmetries of UTe2 with O-edge resonant inelastic X-ray scattering
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• 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
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets in UTe${}_2$
• Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe${}_2$
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Microscopic theory of pair density waves in spin-orbit coupled Kondo lattice
• Observation of vortex stripes in UTe${}_2$
• Spin-glass state in nickelate superconductors
• Magnetic edge fields in UTe${}_2$ near zero background fields