Polymorphism and Superconductivity in RuO<sub>2</sub>
We report substrate-induced superconductivity in rutile RuO2 thin films. By controlling the film’s crystal structure through epitaxial growth on differently oriented TiO2 substrates, we observe superconductivity at 2.1 K exclusively in films grown on (110) TiO2. This superconducting phase, characterized by a coherence length of ξ0 = 13.9 nm, correlates with a structural transition from P42/mnm to Pcab. First-principles calculations confirm this symmetry reduction (D4h14 → D2h15) in (110) oriented films, demonstrating the critical role of lattice symmetry and bond anisotropy in enabling superconductivity in RuO2.
Authors
- Hiroshi Irie (ORCID: https://orcid.org/0000-0002-3524-7463)
- Hideki Yamamoto (ORCID: https://orcid.org/0000-0002-1701-7090)
- Yoshiharu Krockenberger (ORCID: https://orcid.org/0000-0002-7801-2947)
- Yoshitaka Taniyasu
- Jelle Ruiters
Institutions
- NTT Basic Research Laboratories (JP)
Publication Details
- Journal
- The Journal of Physical Chemistry C
- Published
- 2025-09-25
- DOI
- https://doi.org/10.1021/acs.jpcc.5c02378
- Citations
- 3
- Primary Topic
- High-pressure geophysics and materials
- Type
- article
- Field-Weighted Citation Impact
- 5.60