The peculiar superconducting states in uranium ditelluride

Uranium ditelluride (UTe2) is noted for its unusual form of low-temperature superconductivity, which involves spin-triplet pairing and possible nontrivial topology. I will discuss experimental evidence that supports these interpretations and review the current status of ongoing disagreements about the nature of superconductivity and underlying correlations. An even more exotic example of superconductivity – the “Lazarus” phase - is found at high magnetic fields above 40 T. This is a remarkable example of reentrant superconductivity that challenges our understanding of the stability of the superconducting state in magnetic field. I will highlight a counterintuitive recent finding that this reentrant phase is more robust to disorder than its low-field parent superconductivity, yielding an orphan superconductor.

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