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Exotic heavy fermion superconductivity in atomically thin CeCoIn$_5$ films
- Source :
- Phys. Rev. B 107, L041101 (2023)
- Publication Year :
- 2023
-
Abstract
- We report an {\it in-situ} scanning tunneling microscopy study of atomically thin films of CeCoIn$_5$, a $d$-wave heavy-fermion superconductor. Both hybridization and superconducting gaps are observed even in monolayer CeCoIn$_5$, providing direct evidence of superconductivity of heavy quasiparticles mediated by purely two-dimensional bosonic excitations. In these atomically thin films, $T_c$ is suppressed to nearly half of the bulk, but is similar to CeCoIn$_5$/YbCoIn$_5$ superlattices containing CeCoIn$_5$ layers with the same thickness as the thin films. Remarkably, the out-of-plane upper critical field $\mu_0H_{c2\perp}$ at zero temperature is largely enhanced from those of bulk and superlattices. The enhanced $H_{c2\perp}$ well exceeds the Pauli and bulk orbital limits, suggesting the possible emergence of unusual superconductivity with parity mixing caused by the inversion symmetry breaking.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 107, L041101 (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2303.09918
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.107.L041101