Fully Suppressed Superconductivity in Nonferromagnetic Heavy Fermion/Superconductor Bilayers: Rocksalt-Type CeO/LaO.
basic_science · Level V
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- Record sourced from PubMed, PMID 42424622.
- Also identified by DOI 10.1021/acsnano.6c00792.
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Abstract
Superconductor/ferromagnet heterostructures have been investigated extensively because of their capability to break superconducting electron pairs. In this study, we report on heterostructures of a superconductor and heavy-fermion system as an alternative platform for a strong pair-breaking proximity effect. We fabricated rocksalt-type CeO/LaO heteroepitaxial bilayers, where LaO is a superconductor and CeO is a nonferromagnetic heavy-fermion system. While LaO(9.5-21 nm) thin films showed superconductivity below 4.4-5.2 K, the CeO(4.8-5.8 nm)/LaO(9.2-17 nm) bilayers showed no trace of superconductivity down to 0.025 K. This result demonstrates a strong pair-breaking effect at the superconductor/heavy-fermion system heteroepitaxial interface. This effect would provide a useful platform for superconducting micro and nano devices.