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Optical investigation of the metal-insulator transition in the manganite films with the thickness dependence
- Seo, I.W.;
- Lee, Y.S.;
- Seo, J.W.;
- Baek, S.-H.
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4초록
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. © 2019 Korean Physical Society
키워드
Electron-phonon coupling; La0.67Sr0.33MnO3 (LSMO) films; Metal-insulator transition; Thickness dependence; Charge transfer; Electron correlations; Electron-phonon interactions; Lanthanum compounds; Manganese compounds; Manganites; Metal insulator boundaries; Semiconductor insulator boundaries; Strontium compounds; Charge-transfer gap; Crossover behavior; Electron phonon couplings; Ellipsometric technique; Optical investigation; Orbital polarizations; Polaron absorption; Thickness dependence; Metal insulator transition
- 제목
- Optical investigation of the metal-insulator transition in the manganite films with the thickness dependence
- 저자
- Seo, I.W.; Lee, Y.S.; Seo, J.W.; Baek, S.-H.
- 발행일
- 2019-09
- 유형
- Article
- 권
- 19
- 호
- 9
- 페이지
- 1019 ~ 1023
- 언어
- ENG
- 출판사
- Elsevier B.V.
- 발행국가
- 네덜란드
- 분량
- 5 페이지
- ISSN
- E 1878-1675
P 1567-1739