Year: 2021
Type: article
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 UTe2 with surface normal fluid response. The microwave surface impedance of the UTe2 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 UTe2 can be a new platform to study exotic topological excitations in higher dimension.
Source: Nature Communications
Authors: Seokjin Bae, Hyunsoo Kim, Yun Suk Eo, Sheng Ran, I-lin Liu, Wesley T. Fuhrman, Johnpierre Paglione, Nicholas P. Butch, Steven M. Anlage
Institutions: University of Illinois Urbana-Champaign, Maryland Quantum Materials Center, University of Maryland, College Park, Texas Tech University, National Institute of Standards and Technology, Washington University in St. Louis, NIST Center for Neutron Research, Canadian Institute for Advanced Research
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,560
Awards: Novel Superconducting Physics Through Microwave Imaging, A Novel Gap Spectroscopy Tool and Discovery of New Nodal Superconductors, G2198471772, TOPOLOGICAL SUPERCONDUCTIVITY IN STRONG SPIN-ORBIT MATERIALS, PHYSICAL BEHAVIOR OF QUANTUM METAMATERIALS, G5252005133, Johnpierre Paglione Materials Synthesis Investigator, MICROSCOPIC INVESTIGATION OF MATERIALS LIMITATIONS OF SUPERCONDUCTING RF CAVITIES, MICROSCOPIC INVESTIGATION OF MATERIALS LIMITATIONS OF SUPERCONDUCTING RF CAVITIES
OpenAlex ID: W2974115580