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• W2000429382 abstract "Terahertz and infrared spectra of dielectric permittivity and optical conductivity of overdoped manganites La1−xCaxMnO3 (0.5≤x≤1) have been measured at frequencies ν from 4 cm−1 to 700 cm−1 and at temperatures T from 5 K to 300 K. The samples were prepared in the form of bulk polycrystals (ceramics) and epitaxial films (free-standing and on MgO substrates). Strongly asymmetric absorption bands have been found in the compounds which are in charge-ordered state (0.5<x<0.85) and have commensurate calcium doping. The bands are located close to the position of lowest energy van Hove singularity of the folded Brillouin zone. The bands are associated with a boson peak, i.e., with the excess of lattice acoustical vibrational states over the standard Debye contribution (~ν2). In addition, Raman scattering measurements on ceramic samples have been conducted, which confirmed our assignment of the bands’ origin. We firmly identify contribution to the low energy spectra due to quasi-free charge carriers. In the paramagnetic phase all samples show a Drude-like response corresponding to the band type of charge transport. At low temperatures, for the range of dopings 0.5≤x<0.85, the conductivity spectra show signatures of variable-range hopping mechanisms of transport." @default.
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• W2000429382 date "2015-03-01" @default.
• W2000429382 modified "2023-10-01" @default.
• W2000429382 title "Terahertz-infrared spectroscopy of overdoped manganites La1−Ca MnO3" @default.
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• W2000429382 doi "https://doi.org/10.1016/j.physb.2014.11.070" @default.
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