Optical Spectroscopy of Perovskite-Type Manganites.
In: Journal of Superconductivity, Jg. 13 (2000-04-01), Heft 2, S. 271-284
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Zugriff:
Review is given on late optical studies on colossal magnetoresistance (CMR) manganites with perovskite or related structures. In La 1− x Sr x MnO 3 which undergoes a ferromagnetic transition, optical conductivity spectrum σ(ω) 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 2−2 x Sr 1+2 x Mn 2 O 7 ( x = 0.4), with a mid-infrared peak structure due to inter-orbital $$(d_{x^2 - y^2 } \to d_{3z^2 - r^2 } )$$ transition. In Pr 1− x Ca x MnO 3 ( x = 0.4) which undergoes the charge ordering phase transition, σ(ω) 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). [ABSTRACT FROM AUTHOR]
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Titel: |
Optical Spectroscopy of Perovskite-Type Manganites.
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Autor/in / Beteiligte Person: | Okimoto, Y. ; Tokura, Y. |
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Zeitschrift: | Journal of Superconductivity, Jg. 13 (2000-04-01), Heft 2, S. 271-284 |
Veröffentlichung: | 2000 |
Medientyp: | academicJournal |
ISSN: | 0896-1107 (print) |
DOI: | 10.1023/A:1007708218202 |
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