Cesium-mediated electron redistribution and electron-electron interaction in high-pressure metallic CsPbI₃.

ABSTRACT: Electron-phonon coupling was believed to govern the carrier transport in halide perovskites and related phases. Here we demonstrate that electron-electron interaction enhanced by Cs-involved electron redistribution plays a direct and prominent role in the low-temperature electrical transport of compressed CsPbI₃ and renders Fermi liquid (FL)-like behavior. By compressing δ-CsPbI₃ to 80 GPa, an insulator-semimetal-metal transition occurs, concomitant with the completion of a slow structural transition from the one-dimensional Pnma (δ) phase to a three-dimensional Pmn2₁ (ε) phase. Deviation from FL behavior is observed upon CsPbI₃ entering the metallic ε phase, which progressively evolves into a FL-like state at 186 GPa. First-principles density fu

SUBMITTER: Ke F 

PROVIDER: S-EPMC9674642 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature