Raman and optical spectroscopic studies of small-to-large polaron crossover in the perovskite manganese oxides

S. Yoon, H. Liu, G. Schollerer, S. Cooper, P. Han, D. Payne

研究成果: 雜誌貢獻期刊論文同行評審

176 引文 斯高帕斯(Scopus)

摘要

We present an optical reflectance and Raman-scattering study of the (Formula presented) system as a function of temperature and doping (Formula presented) The metal-semiconductor transition in the (Formula presented) system is characterized by a change from a diffusive electronic Raman-scattering response in the high-temperature paramagnetic phase, to a flat continuum scattering response in the low-temperature ferromagnetic phase. We interpret this change in the scattering response as a crossover from a small-polaron-dominated regime at high temperatures to a large-polaron-dominated low-temperature regime. Interestingly, we observe evidence for the coexistence of large and small polarons in the low-temperature ferromagnetic phase. We contrast these results with those obtained for (Formula presented) which is a low-(Formula presented) magnetic semiconductor with similar properties to the manganites, but with a substantially reduced carrier density and polaron energy.

原文英語
頁(從 - 到)2795-2801
頁數7
期刊Physical Review B - Condensed Matter and Materials Physics
58
發行號5
DOIs
出版狀態已發佈 - 1998
對外發佈

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學

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