Estimation of dc transport dynamics in strongly correlated (La,Pr,Ca)MnO{sub 3} film using an insulator-metal composite model for terahertz conductivity

Temperature-dependent conductivities at dc and terahertz (THz) frequency region (σ{sub THz}(ω,T)) were obtained for a strongly correlated (La{sub 0.275}Pr{sub 0.35}Ca{sub 0.375})MnO{sub 3} (LPCMO) film using THz time domain spectroscopy. A composite model that describes σ{sub THz}(ω,T) for LPCMO thr...

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Bibliographic Details
Published in:Applied physics letters 2014-07, Vol.105 (2)
Main Authors: Nguyen, T. V. A., Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Hattori, A. N., Nakamura, T., Fujiwara, K., Tanaka, H., Nagai, M., Ashida, M.
Format: Article
Language:English
Subjects:
CALCIUM COMPOUNDS
COMPOSITE MODELS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRONS
LANTHANUM COMPOUNDS
MANGANATES
MANGANESE OXIDES
METALS
PRASEODYMIUM COMPOUNDS
SIMULATION
SPECTROSCOPY
TEMPERATURE DEPENDENCE
THZ RANGE
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Summary:Temperature-dependent conductivities at dc and terahertz (THz) frequency region (σ{sub THz}(ω,T)) were obtained for a strongly correlated (La{sub 0.275}Pr{sub 0.35}Ca{sub 0.375})MnO{sub 3} (LPCMO) film using THz time domain spectroscopy. A composite model that describes σ{sub THz}(ω,T) for LPCMO through the insulator-metal transition (IMT) was established by incorporating Austin-Mott model characterizing the hopping of localized electrons and Drude model explaining the behavior of free electrons. This model enables us to reliably investigate the dc transport dynamics from THz conductivity measurement, i.e., simultaneously evaluate the dc conductivity and the competing composition of metal and insulator phases through the IMT, reflecting the changes in microscopic conductivity of these phases.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4890109