Author： Okimoto Y.
Publisher： Springer Publishing Company
ISSN： 0896-1107
Source： Journal of Superconductivity: Incorporating Novel Magnetism, Vol.13, Iss.2, 2000-04, pp. : 271-284
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Abstract
Review is given on late optical studies on colossal magnetoresistance (CMR) manganites with perovskite or related structures. In La_1−xSr_xMnO_3 which undergoes a ferromagnetic transition, optical conductivity spectrum () shows a change from a gap-like feature to metallic but highly diffussive one with increasing spin-polarization. Such a remarkable spectral weight transfer is also observed in a layered manganite, La_2−2xSr_1+2xMn_2O_7 (x = 0.4), with a mid-infrared peak structure due to inter-orbital (d_{x^2-y^2} → d_{3z^2-r^2}) transition. In Pr_1−xCa_xMnO_3 (x = 0.4) which undergoes the charge ordering phase transition, () shows an anisotropic feature reflecting charge/orbital ordering pattern at 10 K. The charge-ordered state is transformed into a ferromagnetic metallic state by a magnetic field of 6.5 T at 30 K, which is manifested in a huge change of optical spectra over a wide photon-energy region (0.05 eV–3 eV).
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