Electron-phonon coupling in metallic and plastically deformed strontium titanate

ORAL

Abstract

A significant enhancement of the bulk superconducting transition temperature was recently discovered in electron-doped SrTiO3 single crystals subjected to plastic deformation [1]. Here we present the results of a titanium L-edge resonant inelastic x-ray scattering study of plastically deformed and undeformed electron-doped SrTiO3. No change in electronic coupling to longitudinal optical (LO) phonon modes is observed between deformed and undeformed samples, which places new constraints on the nature of the previously observed Tc enhancement. Furthermore, our measurements of samples with different charge-carrier concentrations enable us to obtain new insight into the role of electronic coupling to LO phonon modes in the superconducting pairing mechanism of electron-doped SrTiO3.

[1] S. Hameed et al., Nat. Mater. 21, 54 (2022)

* Work supported by the Croatian Science Foundation under UIP-2020-02-9494 and by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC0016371.

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Presenters

  • Luka Rogic

    University of Zagreb

Authors

  • Luka Rogic

    University of Zagreb

  • Sajna Hameed

    Max Planck Institute for Solid State Research

  • Issam Khayr

    University of Minnesota, Twin Cities, University of Minnesota

  • Mirian Garcia-Fernandez

    Diamond Light Source

  • Damjan Pelc

    University of Zagreb

  • Martin Greven

    University of Minnesota

  • Matteo Minola

    Max Planck Institute for Solid State Research

  • Bernhard Keimer

    Max Planck Institute for Solid State Physics, Max Planck Institute for Solid State Research