Infrared refractive indices of LaAlO3, LaGaO3, and NdGaO3
Infrared refractive indices of LaAlO3, LaGaO3, and NdGaO3
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LaAlO3、LaGaO3 和 NdGaO3 的红外折射率
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
A. Anderson
中科院分区：
文献类型：
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作者：
Zhuomin M. Zhang;B. Choi;M. Flik;A. Anderson
我们讨论了三种钙钛矿材料的红外光学常数的实验和理论研究：LaAlO 3，LaGaO 3，NdGaO 3。这些材料通常用作沉积高温超导薄膜的衬底。用傅里叶变换红外光谱仪测量透射率和反射率。在1000至10 000 cm-1的频率下，基板是透明的，折射率直接从测量的透射率和反射率中提取。Kramers-Kronig关系式被用来计算这些材料在100 ~ 1000 cm−1频率下的折射率。我们也使用一个洛伦兹声子振子模型来获得折射率通过拟合测量数据的模型函数。每种方法的优点和局限性进行了讨论。的LaAlO 3基板的折射率也得到在10和78 K的低温附件。结果与其他研究小组报告的结果进行了比较。本研究为超导薄膜光学性质的定量研究提供了必要的信息。
We discuss the experimental and theoretical studies of the infrared optical constants of three perovskite materials: LaAlO3, LaGaO3, and NdGaO3. These materials are commonly used as substrates for depositing high-temperature superconducting films. The transmittance and the reflectance are measured with a Fourier-transform infrared spectrometer. At frequencies from 1000 to 10 000 cm−1, for which the substrates are transparent, the refractive index is extracted directly from the measured transmittance and reflectance. Kramers–Kronig relations are employed to yield the refractive index of these materials at frequencies from 100 to 1000 cm−1. We also use a Lorentz phonon oscillator model to obtain the refractive index by fitting the measured data to the model function. The advantages and limitations of each method are discussed. The refractive index for the LaAlO3 substrate is also obtained at 10 and 78 K with a cryogenic accessory. The results are compared with those reported by other research groups. This research provides information necessary for the quantitative study of the optical properties of thin superconducting films.