Wide-range continuous tuning of the thermal conductivity of La_0.5Sr_0.5CoO_3-δ films via room-temperature ion-gel gating.

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 La_0.5Sr_0.5CoO_3-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 e

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC10164146 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature