Abstract
We report on strain engineering of superconductivity in single-crystal films, which are epitaxially grown on rutile and substrates with various crystal orientations. Systematic mappings between the superconducting transition temperature and the lattice parameters reveal that shortening of specific ruthenium–oxygen bonds is a common feature among the superconducting films. Ab initio calculations of electronic and phononic structures for the strained films suggest the importance of soft phonon modes for emergence of the superconductivity. The findings indicate that simple transition metal oxides such as those with a rutile structure may be suitable for further exploring superconductivity by controlling phonon modes through the epitaxial strain.
- Received 5 May 2020
- Accepted 27 August 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.147001
© 2020 American Physical Society
Physics Subject Headings (PhySH)
synopsis
Phonons Are Key in Strained Superconductors
Published 29 September 2020
Substrate-induced strain in thin films generates the kind of phonons that promote superconductivity.
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