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- Title
Hydrogen-induced tunable remanent polarization in a perovskite nickelate.
- Authors
Yuan, Yifan; Kotiuga, Michele; Park, Tae Joon; Patel, Ranjan Kumar; Ni, Yuanyuan; Saha, Arnob; Zhou, Hua; Sadowski, Jerzy T.; Al-Mahboob, Abdullah; Yu, Haoming; Du, Kai; Zhu, Minning; Deng, Sunbin; Bisht, Ravindra S.; Lyu, Xiao; Wu, Chung-Tse Michael; Ye, Peide D.; Sengupta, Abhronil; Cheong, Sang-Wook; Xu, Xiaoshan
- 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. Hydrogen-doping driven metal to ferroelectric phase transition in a complex oxide NdNiO3 is demonstrated. Transient negative differential capacitance and implementation of polarization decay into neural network for learning are then presented.
- Subjects
PHASE transitions; FERROELECTRIC materials; FERROELECTRIC transitions; CONDENSED matter; ELECTRIC fields; FERROELECTRIC polymers; TRANSITION metals
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49213-0