Seo, Il Wan Lee, Y. S. Seo, Ji Won Baek, Seung-Hyub 2024-01-19T19:30:53Z 2024-01-19T19:30:53Z 2021-09-05 2019-09 1567-1739 https://pubs.kist.re.kr/handle/201004/119641 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. English ELSEVIER SCIENCE BV DOUBLE-EXCHANGE Optical investigation of the metal-insulator transition in the manganite films with the thickness dependence Article 10.1016/j.cap.2019.06.002 1 CURRENT APPLIED PHYSICS, v.19, no.9, pp.1019 - 1023 CURRENT APPLIED PHYSICS 19 9 1019 1023 scie scopus kci ART002503623 000472202700010 2-s2.0-85067024507 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article DOUBLE-EXCHANGE La0.67Sr0.33MnO3 (LSMO) films Metal-insulator transition Thickness dependence Electron-phonon coupling