Thermal stimulated current response in cupric oxide single crystal thin films over a wide temperature range. (9th December 2016)

• Record Type: Journal Article
• Authors: Yang, Kungan; Wu, Shuxiang; Yu, Fengmei; Zhou, Wenqi; Wang, Yunjia; Meng, Meng; Wang, Gaili; Zhang, Yueli; Li, Shuwei
• Is Part Of: Journal of physics. Volume 50:Number 3(2017)
• Publication Date: 2016-12-09
• Subjects: multiferroics -- thin film -- cupric oxide; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/50/3/035303
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Cupric oxide single crystal thin films (~26 nm) were grown by plasma-assisted molecular beam epitaxy. X-ray diffraction, Raman spectra and in situ reflection high-energy electron diffraction show that the thin films are 2 × 2 reconstructed with an in-plane compression and out-of-plane stretching. A thermal stimulated current measurement indicates that the electric polarization response is shown in the special 2D cupric oxide single crystal thin film over a wide temperature range from 130 K to near-room temperature. We infer that the abnormal electric response involves the changing of phase transition temperature induced by structure distortion, the spin frustration and the magnetic fluctuation effect of a short-range magnetic order, or the combined action of both of the two factors mentioned above. This work suggests a promising clue for finding new room temperature single phase multiferroics or tuning phase transition temperatures.