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arXiv · 2203.01283

Cesium-involved electron transfer and electron-electron interaction in high-pressure metallic CsPbI3

Feng Ke·Jiejuan Yan·Shanyuan Niu·Jiajia Wen·Ketao Yin·Nathan R. Wolf·Yan-Kai Tzeng·Hemamala I. Karunadasa·Young S. Lee·Wendy L. Mao·Yu Lin
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Abstract

Electron-phonon coupling was believed to govern the carrier transport in halide perovskites and related phases. Here we demonstrate that electron-electron interaction plays a direct and prominent role in the low-temperature electrical transport of compressed CsPbI3 and renders Fermi liquid (FL)-like behavior. By compressing {\delta}-CsPbI3 to 80 GPa, an insulator-to-metal transition occurs, concomitant with the completion of a sluggish structural transition from the one-dimensional (1D) Pnma ({\delta}) phase to a 3D Pmn21 ({\epsilon}) phase. Deviation from FL behavior is observed in CsPbI3 upon entering the metallic {\epsilon} phase, which progressively evolves into a FL-like state at 186 GPa. First-principles density functional theory calculations reveal that the enhanced electron-electron coupling is related to the Cs-involved electron transfer and sudden increase of the 5d state occupation of the high-pressure {\epsilon} phase. Our study presents a promising strategy for tuning the electronic interaction in halide perovskites for realizing intriguing electronic states.

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Feng Ke, Jiejuan Yan, Shanyuan Niu, Jiajia Wen, Ketao Yin, Nathan R. Wolf, Yan-Kai Tzeng, Hemamala I. Karunadasa, Young S. Lee, Wendy L. Mao, Yu Lin. 2022-03-02. Cesium-involved electron transfer and electron-electron interaction in high-pressure metallic CsPbI3. https://doi.org/10.1038/s41467-022-34786-5

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