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Enhanced triplet superconductivity in next generation ultraclean UTe2
- Source :
- PNAS 121 (37) e2403067121 (2024)
- Publication Year :
- 2023
-
Abstract
- The unconventional superconductor UTe$_2$ exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected against decoherence. UTe$_2$ possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, a metamagnetic transition to a field-polarised state, along with pair- and charge-density wave orders. However, contradictory reports between studies performed on UTe$_2$ specimens of varying quality have severely impeded theoretical efforts to understand the microscopic origins of the exotic superconductivity. Here, we report a comprehensive suite of high magnetic field measurements on a new generation of pristine quality UTe$_2$ crystals. Our experiments reveal a significantly revised high magnetic field superconducting phase diagram in the ultraclean limit, showing a pronounced sensitivity of field-induced superconductivity to the presence of crystalline disorder. We employ a Ginzburg-Landau model that excellently captures this acute dependence on sample quality. Our results suggest that in close proximity to a field--induced metamagnetic transition the enhanced role of magnetic fluctuations -- that are strongly suppressed by disorder -- is likely responsible for tuning UTe$_2$ between two distinct spin-triplet superconducting phases.
Details
- Database :
- arXiv
- Journal :
- PNAS 121 (37) e2403067121 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2305.19033
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1073/pnas.2403067121