尖晶石结构LiTi2O4薄膜光学性质研究
Received:December 26, 2016  Revised:February 21, 2017  点此下载全文
引用本文:赵明琳,刘宇翔,连洁,石玉君,宋浩男,贾艳丽,金魁,杨修伦.尖晶石结构LiTi2O4薄膜光学性质研究[J].Journal of Infrared and Millimeter Waves,2017,36(4):460~465
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Author NameAffiliationE-mail
ZHAO Ming-Lin School of Information Science and Engineering,Shandong University zhaominglin90@163.com 
LIU Yu-Xiang School of Information Science and Engineering,Shandong University 18764417255@163.com 
LIAN Jie School of Information Science and Engineering,Shandong University opticsdu@163.com 
SHI Yu-Jun School of Information Science and Engineering,Shandong University  
SONG Hao-Nan School of Information Science and Engineering,Shandong University  
JIA Yan-Li National Lab for Superconductivity,Institute of Physics,Chinese Academy of Sciences  
JIN Kui National Lab for Superconductivity,Institute of Physics,Chinese Academy of Sciences  
YANG Xiu-Lun School of Information Science and Engineering,Shandong University  
基金项目:国家重点基础研究项目 973 (2015CB921003);山东大学基本科研业务费专项资金资助(No.2016JC027)
中文摘要:用激光脉冲沉积(PLD)方法,以MgAl2O4(001)为衬底制备了过渡金属氧化物LiTi2O4薄膜。采用X射线衍射(XRD)对所制备材料进行结构测试,结果表明材料具有立方尖晶石单相结构,结晶性能良好。应用拉曼光谱和光谱椭偏仪(SE)分别研究了材料在常温下的拉曼活性声子特性和可见-近红外波段的折射率和消光系数。应用第一性原理计算了LiTi2O4材料的能带结构和态密度,结果表明理论计算结果和实验测试结果具有很好的一致性,能带计算结果能够很好的解释薄膜的光学常数。
中文关键词:第一性原理  椭偏光谱  消光系数  过渡金属氧化物  高温超导
 
The optical properties of the spinel LiTi2O4 thin film
Abstract:Transition-metal oxides LiTi2O4 thin film was epitaxially grown on MgAl2O4 (001) substrate by pulsed-laser deposition. The X-ray diffraction indicates that the film was successfully grown with high quality and single cubic spinel phase. The Raman-active phonons were studied by Raman spectroscopy. Using spectroscopic ellipsometry, we also determine the refractive index and extinction coefficient of the film in visible-near-infrared region. Band structure and density of states (DOS) of LiTi2O4 were carried out by first-principles calculations. The theoretical calculations are consistent with the experimental results, and the optical constants is well identified by the theoretical band structure.
keywords:first-principles  ellipsometry  extinction coefficient  transition-metal oxides  high temperature superconductor
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