The Positive Temperature Coefficient of Resistivity in BiFeO<sub>3</sub> Films

Qianqian Yang; Xiaolei Wang; Kaihua Yang; Jinxiang Deng; Ruijuan Nie; Qingsong Deng; Xuegang Chen; Hongwei Yang; Kailin Xu; Furen Wang

doi:10.3390/nano12060892

Nanomaterials (Mar 2022)

The Positive Temperature Coefficient of Resistivity in BiFeO<sub>3</sub> Films

Qianqian Yang,
Xiaolei Wang,
Kaihua Yang,
Jinxiang Deng,
Ruijuan Nie,
Qingsong Deng,
Xuegang Chen,
Hongwei Yang,
Kailin Xu,
Furen Wang

Affiliations

Qianqian Yang: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Xiaolei Wang: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Kaihua Yang: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Jinxiang Deng: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Ruijuan Nie: School of Physics, Peking University, Beijing 100871, China
Qingsong Deng: Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China
Xuegang Chen: Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
Hongwei Yang: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Kailin Xu: Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
Furen Wang: School of Physics, Peking University, Beijing 100871, China

DOI: https://doi.org/10.3390/nano12060892
Journal volume & issue: Vol. 12, no. 6
p. 892

Abstract

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The use of lead-free ceramic film materials with positive temperature coefficient of resistivity (PTCR) is widespread in temperature heaters and sensors in micro-electromechanical systems. In this research, the out of plane transport properties of the BiFeO3 (BFO) films have been studied. Surprisingly, PTCR was found in the BFO ceramic films due to the strongly correlated interaction between the multiferroic material BFO and the superconductor YBCO perovskite oxides. To our knowledge, this is the first report on the PTCR effect of BFO films. The BFO/YBCO interface and the bulk conductivity of BFO are important for the PTCR effect, as they make it possible to compare the transport properties of Au/BFO/YBCO- and YBCO/BFO/YBCO-type structures. PTCR was observed in Au/BFO/YBCO at a bias voltage of more than 2 V, but not in the YBCO/BFO/YBCO, even with a 40 V bias voltage. PTCR was found after BFO breakdown of a YBCO/BFO/YBCO capacitor. This indicated that the conductivity of BFO is critical for PTCR. The dependence of PTCR on the superconducting transition temperature illustrates that a cooper-pair can be injected into BFO. Our work presents a method by which to produce a lead-free ceramic film material with PTCR.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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