Reduction of the thermal conductivity in PbTiO<sub>3</sub> thin-films by ferroelectric domain walls.

ORAL

Abstract

The development of materials with switchable thermal conductivity have been limited to small low/high thermal conductivity ratios. We experimentally demonstrate that the thermal conductivity of PbTiO3 films can be significantly reduced through ferroelectric domain wall engineering. Ferroelectric domain walls (DWs) are effective phonon scattering sites, whose density and spacing can be controlled by an electric field, and therefore offer a unique opportunity to modulate the thermal conductivity by an external stimulus. In our experiments, we significantly reduced thermal conductivity by engineering the type and configuration of the DWs, as well as the DW density, through epitaxial strain and impurity doping.

*We acknowledge support from MINECO (Spain), Proj. MAT2016-80762-R, Xunta de Galicia (Centro singular de investigación de Galicia accreditation 2016-2019, ED431G/09) and the European Regional Development Fund.

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Presenters

  • Francisco Rivadulla

    • CIQUS, University of Santiago de Compostela
    • University of Santiago de Compostela

Authors

  • Eric Langenberg

    • Materials Science and Engineering, University of Cornell

  • Davig Bugallo-Ferrón

    • University of Santiago de Compostela

  • Dipanjan Saha

    • Mechanical Engineering, Carnegie Mellon University

  • El�as Ferreiro-Vila

    • University of Santiago de Compostela

  • Jonathan A Malen

    • Mechanical Engineering, Carnegie Mellon University

  • Darrell G. Schlom

    • Cornell University
    • Cornell University, Ithaca, New York 14853, USA
    • Department of Materials Science and Engineering, Cornell University
    • Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University
    • Materials Science & Engineering, Cornell University
    • Department of Materials Science and Engineering,, Cornell University
    • Materials Science and Engineering, University of Cornell

  • Francisco Rivadulla

    • CIQUS, University of Santiago de Compostela
    • University of Santiago de Compostela