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Superconductivity in Uniquely Strained RuO2 Films

Masaki Uchida, Takuya Nomoto, Maki Musashi, Ryotaro Arita, and Masashi Kawasaki
Phys. Rev. Lett. 125, 147001 – Published 29 September 2020
Physics logo See synopsis: Phonons Are Key in Strained Superconductors
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Abstract

We report on strain engineering of superconductivity in RuO2 single-crystal films, which are epitaxially grown on rutile TiO2 and MgF2 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 RuO2 films. Ab initio calculations of electronic and phononic structures for the strained RuO2 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.

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  • 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)

Condensed Matter, Materials & Applied Physics

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Phonons Are Key in Strained Superconductors

Published 29 September 2020

Substrate-induced strain in RuO2 thin films generates the kind of phonons that promote superconductivity.

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Authors & Affiliations

Masaki Uchida1,2,3,*, Takuya Nomoto1, Maki Musashi1,2, Ryotaro Arita1,4, and Masashi Kawasaki1,2,4

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 2Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
  • 3PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
  • 4RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan

  • *Corresponding author. m.uchida@phys.titech.ac.jp

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Issue

Vol. 125, Iss. 14 — 2 October 2020

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