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Wide-range continuous tuning of the thermal conductivity of La0.5Sr0.5CoO3-δ films via room-temperature ion-gel gating

Author

Listed:
  • Yingying Zhang

    (University of Minnesota)

  • William M. Postiglione

    (University of Minnesota)

  • Rui Xie

    (University of Utah)

  • Chi Zhang

    (University of Minnesota)

  • Hao Zhou

    (University of Utah)

  • Vipul Chaturvedi

    (University of Minnesota)

  • Kei Heltemes

    (University of Minnesota)

  • Hua Zhou

    (Argonne National Laboratory)

  • Tianli Feng

    (University of Utah)

  • Chris Leighton

    (University of Minnesota)

  • Xiaojia Wang

    (University of Minnesota)

Abstract

Solid-state control of the thermal conductivity of materials is of exceptional interest for novel devices such as thermal diodes and switches. Here, we demonstrate the ability to continuously tune the thermal conductivity of nanoscale films of La0.5Sr0.5CoO3-δ (LSCO) by a factor of over 5, via a room-temperature electrolyte-gate-induced non-volatile topotactic phase transformation from perovskite (with δ ≈ 0.1) to an oxygen-vacancy-ordered brownmillerite phase (with δ = 0.5), accompanied by a metal-insulator transition. Combining time-domain thermoreflectance and electronic transport measurements, model analyses based on molecular dynamics and Boltzmann transport equation, and structural characterization by X-ray diffraction, we uncover and deconvolve the effects of these transitions on heat carriers, including electrons and lattice vibrations. The wide-range continuous tunability of LSCO thermal conductivity enabled by low-voltage (below 4 V) room-temperature electrolyte gating opens the door to non-volatile dynamic control of thermal transport in perovskite-based functional materials, for thermal regulation and management in device applications.

Suggested Citation

  • Yingying Zhang & William M. Postiglione & Rui Xie & Chi Zhang & Hao Zhou & Vipul Chaturvedi & Kei Heltemes & Hua Zhou & Tianli Feng & Chris Leighton & Xiaojia Wang, 2023. "Wide-range continuous tuning of the thermal conductivity of La0.5Sr0.5CoO3-δ films via room-temperature ion-gel gating," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38312-z
    DOI: 10.1038/s41467-023-38312-z
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    References listed on IDEAS

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    1. Jiung Cho & Mark D. Losego & Hui Gang Zhang & Honggyu Kim & Jianmin Zuo & Ivan Petrov & David G. Cahill & Paul V. Braun, 2014. "Electrochemically tunable thermal conductivity of lithium cobalt oxide," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
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