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- W2077076140 abstract "The temperature (10--290 K) and magnetic-field (0--7 T) dependencies of optical spectra and their anisotropy have been investigated for a single crystal of ${mathrm{Pr}}_{1ensuremath{-}x}{mathrm{Ca}}_{x}{mathrm{MnO}}_{3}(x=0.4),$ which undergoes a charge and orbital ordering transition at ${T}_{mathrm{co}}=235 mathrm{K}.$ A clear anisotropic feature has been observed between the b- and c-axis polarized optical conductivity spectra $[ensuremath{sigma}(ensuremath{omega})]$ at 10 K, reflecting a pattern of spatial charge and orbital ordering. The gap value of the charge-ordered (CO) state is estimated to be $ensuremath{approx}0.18 mathrm{eV}$ in the ground state. $ensuremath{sigma}(ensuremath{omega})$ is drastically transformed from an anisotropic gaplike shape into an isotropic metallic band with a conspicuous spectral weight transfer over a wide photon energy region (0.05--3 eV) by application of a magnetic field of 7 T. As the magnetic field is decreased from 7 T, such metallic $ensuremath{sigma}(ensuremath{omega})$ suddenly becomes gaplike again around 4.5 T, yet the anisotropy between both polarizations is decreased perhaps owing to orbital disordering. The temperature dependence of the b-axis polarized $ensuremath{sigma}(ensuremath{omega})$ was investigated in a constant magnetic field of 7 T. As the temperature decreases, the onset energy of $ensuremath{sigma}(ensuremath{omega})$ shows a blueshift from ${T}_{mathrm{co}}$ down to the antiferromagnetic spin ordering temperature ${T}_{N},$ but shows a redshift once the spin ordering takes place below ${T}_{N}.$ This result indicates that the charge gap value as the order parameter of the CO state couples with the spin ordering." @default.
- W2077076140 created "2016-06-24" @default.
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- W2077076140 date "1999-03-15" @default.
- W2077076140 modified "2023-10-06" @default.
- W2077076140 title "Optical study of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnO</mml:mi></mml:mrow><mml:…" @default.
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- W2077076140 doi "https://doi.org/10.1103/physrevb.59.7401" @default.
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