Absence of Spontaneous Magnetic Fields Due to Time-Reversal Symmetry Breaking in Bulk Superconducting UTe2

Abstract

We have investigated the low-temperature local magnetic properties in the bulk of molten salt-flux (MSF) grown single crystals of the candidate odd-parity superconductor UTe2 by zero-field muon spin relaxation (muSR). In contrast to previous muSR studies of UTe2 single crystals grown by a chemical vapour transport (CVT) method, we find no evidence of magnetic clusters or electronic moments fluctuating slow enough to cause a discernible relaxation of the zero-field muSR asymmetry spectrum. Consequently, our measurements on MSF-grown single crystals rule out the generation of spontaneous magnetic fields in the bulk that would occur near impurities or lattice defects if the superconducting state of UTe2 breaks time-reversal symmetry. This result suggests UTe2 is characterized by a single-component superconducting order parameter.

5 pages, 3 figures

References in corpus (12)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Unconventional Superconductivity in Heavy Fermion UTe2
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• The fate of time-reversal symmetry breaking in UTe2
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• 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
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor UTe${}_2$
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice

Cited by in corpus (23)

• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Quantum interference between quasi-2D Fermi surface sheets in UTe2
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Chiral and topological superconductivity in isospin polarized multilayer graphene
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Anisotropic field-induced changes in the superconducting order parameter of UTe2
• Hydrostatic pressure studies on non-superconducting UTe2
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets 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
• Nodal superconducting gap structure and topological surface states of 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
• Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe${}_2$
• Modified Martin-Puplett interferometer for magneto-optical Kerr effect measurements at sub-THz frequencies
• Dramatic elastic response at the critical end point in UTe${}_2$
• Thermal conductivity of nonunitary triplet superconductors: application to UTe${}_2$
• Observation of vortex stripes in UTe${}_2$
• Magnetic edge fields in UTe${}_2$ near zero background fields
• Revealing isotropic abundant low-energy excitations in UTe${}_2$ through complex microwave surface impedance
• Signature of chiral superconducting order parameter evidenced in mesoscopic superconductors