Chiral superconductivity in heavy-fermion metal UTe2

Lin Jiao, Sean Howard, Sheng Ran, Zhenyu Wang, Jorge Olivares Rodriguez, Manfred Sigrist, Ziqiang Wang, Nicholas P. Butch and Vidya Madhavan ()
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Lin Jiao: University of Illinois Urbana-Champaign
Sean Howard: University of Illinois Urbana-Champaign
Sheng Ran: National Institute of Standards and Technology
Zhenyu Wang: University of Illinois Urbana-Champaign
Jorge Olivares Rodriguez: University of Illinois Urbana-Champaign
Manfred Sigrist: ETH Zurich
Ziqiang Wang: Boston College
Nicholas P. Butch: National Institute of Standards and Technology
Vidya Madhavan: University of Illinois Urbana-Champaign

Nature, 2020, vol. 579, issue 7800, 523-527

Abstract: Abstract Spin-triplet superconductors are condensates of electron pairs with spin 1 and an odd-parity wavefunction1. An interesting manifestation of triplet pairing is the chiral p-wave state, which is topologically non-trivial and provides a natural platform for realizing Majorana edge modes2,3. However, triplet pairing is rare in solid-state systems and has not been unambiguously identified in any bulk compound so far. Given that pairing is usually mediated by ferromagnetic spin fluctuations, uranium-based heavy-fermion systems containing f-electron elements, which can harbour both strong correlations and magnetism, are considered ideal candidates for realizing spin-triplet superconductivity4. Here we present scanning tunnelling microscopy studies of the recently discovered heavy-fermion superconductor UTe2, which has a superconducting transition temperature of 1.6 kelvin5. We find signatures of coexisting Kondo effect and superconductivity that show competing spatial modulations within one unit cell. Scanning tunnelling spectroscopy at step edges reveals signatures of chiral in-gap states, which have been predicted to exist at the boundaries of topological superconductors. Combined with existing data that indicate triplet pairing in UTe2, the presence of chiral states suggests that UTe2 is a strong candidate for chiral-triplet topological superconductivity.

Date: 2020
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DOI: 10.1038/s41586-020-2122-2

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