Optical investigation of the metal-insulator transition in the manganite films with the thickness dependence

被引：4
作者：
Seo, Il Wan [1 ]
Lee, Y. S. [1 ]
Seo, Ji Won [2 ]
Baek, Seung-Hyub [3 ]
机构：
[1] Soongsil Univ, Dept Phys, Seoul 06978, South Korea
[2] Yonsei Univ, Dept Phys, Wonju 26493, South Korea
[3] Korea Inst Sci & Technol, Ctr Elect Mat, Seoul 02792, South Korea
来源：
CURRENT APPLIED PHYSICS | 2019年 / 19卷 / 09期
基金：
新加坡国家研究基金会;
关键词：
La0.67Sr0.33MnO3 (LSMO) films; Metal-insulator transition; Thickness dependence; Electron-phonon coupling; DOUBLE-EXCHANGE;
D O I：
10.1016/j.cap.2019.06.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigated the optical response of La0.67Sr0.33MnO3 (LSMO) films which show the metal-insulator transition (MIT) with the film thickness dependence. By using spectroscopic ellipsometric technique we found that the optical spectra below the charge transfer gap exhibited the coherent-incoherent crossover behavior through MIT. The formation of the incoherent mode near 1.5 eV was reminiscent of the polaron absorption which had been widely observed in various manganites. We suggest that the electron-phonon coupling could be enhanced due to low dimensionality in the ultrathin LSMO film in consideration of orbital polarization.
引用
收藏
页码：1019 / 1023
页数：5
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