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Terahertz–infrared electrodynamics of overdoped manganites La.sub.1-x./sub.Ca.sub.x./sub.MnO.sub.3./sub
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SYSNO ASEP 0439482 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Terahertz–infrared electrodynamics of overdoped manganites La1-xCaxMnO3./sub Author(s) Kadyrov, L.S. (RU)
Gorshunov, B.P. (RU)
Zhukova, E.S. (RU)
Torgashev, V. I. (RU)
Prokhorov, A. S. (RU)
Motovilova, E.A. (RU)
Fischgrabe, F. (DE)
Moshnyaga, V.T. (DE)
Zhang, T. (CN)
Kremer, R. K. (DE)
Pracht, U. (DE)
Zapf, S. (DE)
Pokorný, Jan (FZU-D) RID, ORCID
Untereiner, G. (DE)
Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Dressel, M. (DE)Source Title Phase Transitions. - : Taylor & Francis - ISSN 0141-1594
Roč. 87, 10-11 (2014), s. 1050-1059Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords manganites ; terahertz Subject RIV BM - Solid Matter Physics ; Magnetism Institutional support FZU-D - RVO:68378271 UT WOS 000345840100016 EID SCOPUS 84908079582 DOI 10.1080/01411594.2014.953508 Annotation We have measured low-temperature terahertz and infrared spectra of La1–xCa xMnO3 with x = 0.5; 0.6; 2/3, 0.7; 3/4, 0.85; 0.9; 0.95; 0.98 and x = 1 in the form of ceramics and epitaxial films. In the charge-ordered state for commensurate dopings (x = 2/3 and 3/4), we observed an absorption band at frequencies corresponding to the position of the lowest energy van Hove singularity in the folded Brillouin zone. The band is assigned to the boson peak. We observed qualitatively the same boson peak in Raman spectra of La1/3Ca2/3MnO3 ceramics. In antiferromagnetic phase, for the 0.5 ≤ x < 0.85 range of doping, the conductivity mechanism gradually changes from a hopping-like transport at low temperatures to the Drude behavior at elevated temperatures in the paramagnetic phase. For 0.85 ≤ x < 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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