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Asmara","submitted_at":"2015-01-13T12:32:49Z","abstract_excerpt":"We study the temperature dependence as well as anisotropy of optical conductivity ($\\sigma_1$) in the pseudocubic single crystal Pr$_{0.5}$Ca$_{1.5}$MnO$_{4}$ using spectrocopic ellipsometry. Three transition temperatures are observed and can be linked to charge-orbital ($T_{\\rm CO/OO}$ $\\sim$ 320 K), two-dimensional-antiferromagnetic (2D-AFM) ($\\sim$ 200 K), and three-dimensional AFM ($T_{\\rm N} \\sim$ 125 K) orderings. Below $T_{\\rm CO/OO}$, $\\sigma_1$ shows a charge ordering peak ($\\sim$0.8 eV) with a significant blue shift as the temperature decreases. 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