Hydrogen-induced tunable remanent polarization in a perovskite nickelate

Yifan Yuan (), Michele Kotiuga (), Tae Joon Park (), Ranjan Kumar Patel, Yuanyuan Ni, Arnob Saha, Hua Zhou, Jerzy T. Sadowski, Abdullah Al-Mahboob, Haoming Yu, Kai Du, Minning Zhu, Sunbin Deng, Ravindra S. Bisht, Xiao Lyu, Chung-Tse Michael Wu, Peide D. Ye, Abhronil Sengupta, Sang-Wook Cheong, Xiaoshan Xu, Karin M. Rabe and Shriram Ramanathan ()
Additional contact information
Yifan Yuan: The State University of New Jersey
Michele Kotiuga: École Polytechnique Fédérale de Lausanne (EPFL)
Tae Joon Park: Purdue University
Ranjan Kumar Patel: The State University of New Jersey
Yuanyuan Ni: University of Nebraska–Lincoln
Arnob Saha: University Park
Hua Zhou: Argonne National Laboratory
Jerzy T. Sadowski: Brookhaven National Laboratory
Abdullah Al-Mahboob: Brookhaven National Laboratory
Haoming Yu: Purdue University
Kai Du: The State University of New Jersey
Minning Zhu: The State University of New Jersey
Sunbin Deng: Purdue University
Ravindra S. Bisht: The State University of New Jersey
Xiao Lyu: Purdue University
Chung-Tse Michael Wu: The State University of New Jersey
Peide D. Ye: Purdue University
Abhronil Sengupta: University Park
Sang-Wook Cheong: The State University of New Jersey
Xiaoshan Xu: University of Nebraska–Lincoln
Karin M. Rabe: The State University of New Jersey
Shriram Ramanathan: The State University of New Jersey

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Materials with field-tunable polarization are of broad interest to condensed matter sciences and solid-state device technologies. Here, using hydrogen (H) donor doping, we modify the room temperature metallic phase of a perovskite nickelate NdNiO3 into an insulating phase with both metastable dipolar polarization and space-charge polarization. We then demonstrate transient negative differential capacitance in thin film capacitors. The space-charge polarization caused by long-range movement and trapping of protons dominates when the electric field exceeds the threshold value. First-principles calculations suggest the polarization originates from the polar structure created by H doping. We find that polarization decays within ~1 second which is an interesting temporal regime for neuromorphic computing hardware design, and we implement the transient characteristics in a neural network to demonstrate unsupervised learning. These discoveries open new avenues for designing ferroelectric materials and electrets using light-ion doping.

Date: 2024
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DOI: 10.1038/s41467-024-49213-0

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