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arXiv · 1605.00109

Thermal stimulated current response in cupric oxide single crystal thin films over a wide temperature range

K. G. Yang·S. X. Wu·F. M. Yu·W. Q. Zhou·Y. J. Wang·M. Meng·G. L. Wang·Y. L. Zhang·S. W. Li
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Abstract

Cupric oxide single crystal thin films were grown by plasma-assisted molecular beam epitaxy. X-ray diffraction, Raman spectrum and in situ reflection high-energy electron diffraction show that the thin films are 2x2 reconstructed with an in-plane compression and out-of-plane stretching. Thermal stimulated current measurement indicates that the electric polarization response presents 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 magnetic fluctuation effect of short-range magnetic order, or the combined action of both two factors mentioned above. This work suggests a promising clue for finding new room temperature single phase multiferroics or tuning phase transition temperature.

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K. G. Yang, S. X. Wu, F. M. Yu, W. Q. Zhou, Y. J. Wang, M. Meng, G. L. Wang, Y. L. Zhang, S. W. Li. 2016-04-30. Thermal stimulated current response in cupric oxide single crystal thin films over a wide temperature range. https://doi.org/10.1088/1361-6463%2F50%2F3%2F035303

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