La0. 7Sr. 3 MnO 3外延薄膜的显微拉曼光谱和电阻测量
Micro-Raman and resistance measurements of epitaxial La0.7Sr0.3MnO3 films
摘要：
采用Spark法在NdGaO 3衬底上沉积了高取向的铁磁La_（0.7）Sr_（0.3）MnO_3薄膜。结果发现，额外的氧降低了薄膜的质量，抑制居里温度和金属-绝缘体转变低于室温。为了获得最佳质量的薄膜，样品要么在沉积温度下在高真空中退火，要么甚至在氩气气氛中沉积，没有氧气退火。对于这样的膜的电阻测量显示了金属的行为在区间10-300 K根据高居里点（Tc 350 K）。显微拉曼光谱分析表明，La_（0.7）Sr_（0.3）MnO_3薄膜具有良好的有序性，但某些副产物存在化学计量偏差。
英文摘要：
The Channel-Spark method was used for deposition of highly oriented ferromagnetic La0.7Sr0.3MnO3 films on NdGaO3 substrates. It was found that additional oxygen decreases the film quality suppressing the Curie temperature and metal-insulator transition below the room temperature. To achieve the best quality of the films the samples were either annealed in high vacuum at deposition temperature or even deposited in argon atmosphere with no oxygen annealing. For such films the resistive measurements showed a metallic behaviour in the interval 10-300 K in accordance with the high Curie point (Tc 350 K). Micro-Raman analysis indicate that the La0.7Sr0.3MnO3 films are well ordered, while some outgrowths show stoichiometrical deviations.
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