| Title | The Positive Temperature Coefficient of Resistivity in BiFeO3 Films |
| Authors | Yang, Qianqian Wang, Xiaolei Yang, Kaihua Deng, Jinxiang Nie, Ruijuan Deng, Qingsong Chen, Xuegang Yang, Hongwei Xu, Kailin Wang, Furen |
| Affiliation | Beijing Univ Technol, Fac Sci, Dept Phys & Optoelect Engn, Beijing 100124, Peoples R China Peking Univ, Sch Phys, Beijing 100871, Peoples R China Beijing Univ Technol, Inst Microstruct & Properties Adv Mat, Beijing 100124, Peoples R China Anhui Univ, Inst Phys Sci, Hefei 230601, Peoples R China Anhui Univ, Inst Informat Technol, Hefei 230601, Peoples R China |
| Keywords | OXYGEN VACANCIES BATIO3 RESISTANCE MODELS |
| Issue Date | Mar-2022 |
| Publisher | NANOMATERIALS |
| Abstract | 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. |
| URI | http://hdl.handle.net/20.500.11897/641700 |
| DOI | 10.3390/nano12060892 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
