Journal
SCIENCE
Volume 373, Issue 6556, Pages 797-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abb0272
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Funding
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Gordon and Betty Moore Foundation through Emergent Phenomena in Quantum Systems (EPiQS) Initiative [GBMF4529]
- Air Force Office of Scientific Research Award [FA9550-14-1-0332]
- Department of Energy [DE-SC-0019154]
- National Science Foundation Division of Materials Research Award [DMR-1905891]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF9071]
- Maryland Quantum Materials Center
- National Institute of Standards and Technology [70NANB17H301]
- Karel Urbanek Fellowship in Applied Physics at Stanford University
- NIST
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The superconductivity in UTe2 is characterized by a two-component order parameter that breaks time-reversal symmetry, as shown by observations of a nonzero polar Kerr effect and two transitions in specific heat. These findings place constraints on the symmetries of the order parameter and contribute to the discussion on the presence of topological superconductivity in UTe2.
An unconventional superconducting state was recently discovered in uranium ditelluride (UTe2), in which spin-triplet superconductivity emerges from the paramagnetic normal state of a heavy-fermion material. The coexistence of magnetic fluctuations and superconductivity, together with the crystal structure of this material, suggests that a distinctive set of symmetries, magnetic properties, and topology underlie the superconducting state. Here, we report observations of a nonzero polar Kerr effect and of two transitions in the specific heat upon entering the superconducting state, which together suggest that the superconductivity in UTe2 is characterized by a two-component order parameter that breaks time-reversal symmetry. These data place constraints on the symmetries of the order parameter and inform the discussion on the presence of topological superconductivity in UTe2.
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