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Issue 27, 2020
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Frequency switchable correlated transports in perovskite rare-earth nickelates

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While electron correlations were previously recognized to result in direct current (DC) transportation properties beyond-conventional (e.g., metal-to-insulator transitions, bad metal, thermistors), their respective influences on the alternating current (AC) transport are largely overlooked. Herein, active regulation of the electronic functionalities of d-band correlated rare-earth nickelate (ReNiO3) thin films, by simply utilizing their electronic responses to AC-frequencies (fAC) is demonstrated. Assisted by temperature dependent near edge X-ray absorption fine structure analysis, positive temperature dependences in the Coulomb viscosity of ReNiO3 were discovered, which moderate their AC impedance (R′ + iR′′). Distinguished crosslinking among R′–fAC measured in nearby temperatures is observed that differs to conventional oxides. This enables active adjustability in correlated transports of ReNiO3, among NTCR-, TDelta- and PTCR-thermistors, via fAC from the electronic perspective without varying materials or device structures. Furthermore the TDeltafAC relationship can be widely adjusted via the Re composition and interfacial strains. The AC-frequency sensitivity discovered in ReNiO3 leads the way to a new freedom in regulating and switching the device working states beyond the present semiconductor technologies. It opens up a new model for enriching novel electronic applications in automatic transmission, artificial intelligence in sensing temperatures or thermal perturbations.

Graphical abstract: Frequency switchable correlated transports in perovskite rare-earth nickelates

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Supplementary files

Article information

05 May 2020
16 Jun 2020
First published
17 Jun 2020

J. Mater. Chem. A, 2020,8, 13630-13637
Article type

Frequency switchable correlated transports in perovskite rare-earth nickelates

J. Chen, H. Li, J. Wang, X. Ke, B. Ge, J. Chen, H. Dong, Y. Jiang and N. Chen, J. Mater. Chem. A, 2020, 8, 13630
DOI: 10.1039/D0TA04663A

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