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• W331415637 abstract "We investigate the polarized reflectance and optical conductivity of $({mathrm{La}}_{0.4}{mathrm{Pr}}_{0.6}{)}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ over a wide energy and temperature range in order to explore the dynamics and enhanced magnetic properties of this material compared with that of ${mathrm{La}}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ and related manganites. Compared with the unsubstituted parent compound, $({mathrm{La}}_{0.4}{mathrm{Pr}}_{0.6}{)}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ displays substantially broadened vibrational modes at low temperature as well as three additional electronic excitations at 65 meV, 2.05 eV, and 4.4 eV. These features are made manifest by Pr substitution and the consequent local symmetry breaking around the ${mathrm{MnO}}_{6}$ octahedra, the signature of which still dominates the spectra. The electronic excitation in the far infrared (65 meV) is particularly notable, as it grows and red shifts with decreasing temperature. Although this low-energy localized excitation is sensitive to the 98 K semiconductor-to-semiconductor transition in $({mathrm{La}}_{0.4}{mathrm{Pr}}_{0.6}{)}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7},$ it does not develop into a free-carrier response at low temperature. We attribute this broad, bound-carrier excitation in $({mathrm{La}}_{0.4}{mathrm{Pr}}_{0.6}{)}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ to disorder-induced localization. The low-energy bound carriers are thus responsible for the semiconducting ground state over the full temperature range and may be intimately connected with the improved magnetoresistance properties of this material." @default.
• W331415637 created "2016-06-24" @default.
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• W331415637 date "2004-03-19" @default.
• W331415637 modified "2023-09-26" @default.
• W331415637 title "Disorder-induced localization in(La0.4Pr0.6)1.2Sr1.8Mn2O7as investigated by variable-temperature optical techniques" @default.
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• W331415637 doi "https://doi.org/10.1103/physrevb.69.104415" @default.
• W331415637 hasPublicationYear "2004" @default.
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