Ultrahigh room-temperature hole conductivity in a perovskite cuprate with vanishing electron-correlation

Meng Wang; Jianbing Zhang; Liang Si; Sijie Wu; Caiyong Li; Wenfeng Wu; Xiaodong Zhang; Cong Li; Lu Wang; Fachao Li; Lingzhi Wen; Yang Liu; Jinling Zhou; Masahiro Sawada; Nianpeng Lu; Qing He; Peng Gao; Tian Liang; Shuyun Zhou; Yeliang Wang; Fumitaka Kagawa; Pu Yu

arXiv · 2504.07369

Ultrahigh room-temperature hole conductivity in a perovskite cuprate with vanishing electron-correlation

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Abstract

Electron-correlated two-dimensional (2D) cuprates have been extensively studied since the discovery of high-Tc superconductivity, in contrast, the three-dimensional (3D) counterpart perovskite cuprates remain largely unexplored due to their chemical instability and synthesis challenges. Herein, we develop an efficient two-step approach that combines symmetry-selective growth and topotactic oxidization to synthesize high-quality perovskite LaCuO3 films, and furthermore reveal its exotic electronic states. The compressively strained LaCuO3 films exhibit an unexpected ultrahigh p-type conductivity of ~1.5*10^5 S/cm with a hole mobility of ~30 cm2 V-1 s-1 at room-temperature. X-ray absorption spectra and first-principles calculations unveil a ligand-hole state of p-d hybridization with degenerate eg orbitals and light effective mass, indicating nearly-vanishing electron-correlation. These features contrast sharply with 2D cuprates and offer physical insights into the design of high-performance electronic devices.

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Meng Wang, Jianbing Zhang, Liang Si, Sijie Wu, Caiyong Li, Wenfeng Wu, Xiaodong Zhang, Cong Li, Lu Wang, Fachao Li, Lingzhi Wen, Yang Liu, Jinling Zhou, Masahiro Sawada, Nianpeng Lu, Qing He, Peng Gao, Tian Liang, Shuyun Zhou, Yeliang Wang, Fumitaka Kagawa, Pu Yu. 2025-04-10. Ultrahigh room-temperature hole conductivity in a perovskite cuprate with vanishing electron-correlation. https://arxiv.org/abs/2504.07369

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