2026-07-10 東北大学
図1. パルスレーザー堆積法の概略図。
＜関連情報＞
- https://www.tohoku.ac.jp/japanese/2026/07/press20260710-02-nonferromagnetic.html
- https://pubs.acs.org/doi/10.1021/acsnano.6c00792
非強磁性重フェルミオン/超伝導体二層構造における超伝導の完全抑制：岩塩型CeO/LaO Fully Suppressed Superconductivity in Nonferromagnetic Heavy Fermion/Superconductor Bilayers: Rocksalt-Type CeO/LaO
Mikito Sekine,Masamichi Negishi,Satoshi Sasaki,Hidetatsu Yoshimura,Noriaki Kimura,and Tomoteru Fukumura
ACS Nano Published July 9, 2026
DOI:https://doi.org/10.1021/acsnano.6c00792
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.
