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Zhang Y, Postiglione WM, Xie R, Zhang C, Zhou H, Chaturvedi V, Heltemes K, Zhou H, Feng T, Leighton C, Wang X. Wide-range continuous tuning of the thermal conductivity of La 0.5Sr 0.5CoO 3-δ films via room-temperature ion-gel gating. Nat Commun 2023; 14:2626. [PMID: 37149614 PMCID: PMC10164146 DOI: 10.1038/s41467-023-38312-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 04/25/2023] [Indexed: 05/08/2023] Open
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.
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Affiliation(s)
- Yingying Zhang
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
| | - William M Postiglione
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Rui Xie
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Chi Zhang
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Hao Zhou
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Vipul Chaturvedi
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Kei Heltemes
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Hua Zhou
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Tianli Feng
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Chris Leighton
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA.
| | - Xiaojia Wang
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, 55455, USA.
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