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Giant negative photoresistance of epitaxial manganite La2/3Ca1/3MnO3−δ film

外延锰氧化物薄膜 La2/3Ca1/3MnO3-δ 中的巨大光致电阻

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Abstract

The La2/3Ca1/3MnO3−δ film has been deposited on the (001) SrTiO3 substrate and its temperature-dependent photoconductive properties have been investigated from 80 to 300 K. The La2/3Ca1/3MnO3−δ film has a novel photoelectric property due to its oxygen-deficient structure. We observed laser-induced giant negative photoresistance of the sample in a wide temperature range. The change rate of negative photoresistance was nearly 100% at the low temperature when the sample was irradiated by 532 nm laser. In addition, this effect was sensitive to the power of laser irradiation. The oxygen-deficiency of La2/3Ca1/3MnO3−δ film seems to have an impact on the laser-induced resistance variation. The experimental results made the La2/3Ca1/3MnO3−δ film a promising application as a photoswitch device.

摘要

研究意义

钙钛矿锰氧化物以其独特的物理特性占据了光电材料研究领域的重要一隅. 这类材料的物理性质极为丰富, 涉及到多体、, 绝缘体-金属转变等许多材料科学以及凝聚态物理的基本问题. 由于电子之间的强关联效应, 钙钛矿氧化物中存在着电荷序、 轨道序、 自旋序的相互竞争和相互影响. 光激发方法不仅可以影响体系的电荷结构、, 改变载流子浓度, 而且还可能引起体系中载流子自旋态的改变. 因此, 钙钛矿锰氧化物材料的物理特性与光辐射场的关系引起了研究者的极大关注. 研究钙钛矿锰氧化物不仅对揭示强关联体系氧化物电子相互作用的物理机理具有积极意义, 而且在光电探测、 光伏发电、光致开关等领域具有广阔的应用前景.

创新要点

我们在 SrTiO3 基底上外延生长了 La2/3Ca1/3MnO3-δ 薄膜, La2/3Ca1/3MnO3-δ 薄膜晶格内氧原子的空缺对薄膜性质产生了重要影响. 使用 532nm 的激光照射样品研究 La2/3Ca1/3MnO3-δ 薄膜由低温到室温的光致电阻的变化, 我们发现 160K 的温度下 La2/3Ca1/3MnO3-δ 薄膜的光致电阻变化率接近 100%, 这说明缺氧 La2/3Ca1/3MnO3-δ 薄膜可以作为一种新型材料应用于光开关器件.

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Authors and Affiliations

  1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China

    JianFeng Xi & Kun Zhao

  2. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing, 102249, China

    JianFeng Xi, Kun Zhao, Hao Ni, WenFeng Xiang, Xin Feng, Qi Sun, ZhiQing Lu & LiZhi Xiao

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  1. JianFeng Xi
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Correspondence to Kun Zhao.

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Xi, J., Zhao, K., Ni, H. et al. Giant negative photoresistance of epitaxial manganite La2/3Ca1/3MnO3−δ film. Sci. China Inf. Sci. 58, 1–7 (2015). https://doi.org/10.1007/s11432-015-5436-1

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