Optical investigation of the metal-insulator transition in the manganitefilmswith the thickness dependence

Title
Optical investigation of the metal-insulator transition in the manganitefilmswith the thickness dependence
Authors
백승협Il Wan SeoY.S. LeeJi Won Seo
Issue Date
2019-09
Publisher
Current applied physics
Citation
VOL 19, NO 9-1023
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/70053
ISSN
1567-1739
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KIST Publication > Article
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