Anomalous normal fluid response in a chiral superconductor UTe<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33976162.
- Also identified by DOI 10.1038/s41467-021-22906-6 and PMC identifier 8113495.
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Abstract
Chiral superconductors have been proposed as one pathway to realize Majorana normal fluid at its boundary. However, the long-sought 2D and 3D chiral superconductors with edge and surface Majorana normal fluid are yet to be conclusively found. Here, we report evidence for a chiral spin-triplet pairing state of UTe<sub>2</sub> with surface normal fluid response. The microwave surface impedance of the UTe<sub>2</sub> crystal was measured and converted to complex conductivity, which is sensitive to both normal and superfluid responses. The anomalous residual normal fluid conductivity supports the presence of a significant normal fluid response. The superfluid conductivity follows the temperature behavior predicted for an axial spin-triplet state, which is further narrowed down to a chiral spin-triplet state with evidence of broken time-reversal symmetry. Further analysis excludes trivial origins for the observed normal fluid response. Our findings suggest that UTe<sub>2</sub> can be a new platform to study exotic topological excitations in higher dimension.