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Raman spectroscopy of the charge- and orbital-ordered state in La0.5Ca0.5MnO3
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2001 (Engelska)Ingår i: Physical Review B, Vol. 64, nr 14Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Polarized Raman spectra from microcrystals of La0.5Ca0.5MnO3 were studied as a function of temperature, excitation photon energy, and scattering configuration. At temperatures below the transition from ferromagnetic metallic phase to antiferromagnetic insulating charge- and orbital-ordered (COO) phase, several lines appear in Raman spectra excited with photon energies (h) over bar omega (L)<2.5 eV. We argue that their appearance signals ordering and freezing of the Jahn-Teller distortions at this transition temperature into a superstructure with a doubled elementary cell. We suggest a simplified structural model based on an analysis of the normal phonon modes in the COO phase, neglecting the octahedral tilts and containing ordered Mn4+O6 (undistorted) and Mn3+O6 (Jahn-Teller distorted) octahedra. The symmetries of the experimentally observed Raman lines are determined by comparing their relative intensities to those predicted by the polarization selection rules for a finely twinned quasicubic crystal. The most intensive Raman lines are assigned to definite normal modes in close comparison with corresponding modes in COO layered manganites and undoped RMnO3 (R=La, Y).

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2001. Vol. 64, nr 14
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Naturvetenskap
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URN: urn:nbn:se:miun:diva-14335DOI: 10.1103/PhysRevB.64.144429OAI: oai:DiVA.org:miun-14335DiVA, id: diva2:435978
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Times Cited: 33Tillgänglig från: 2011-08-22 Skapad: 2011-08-19 Senast uppdaterad: 2011-11-27Bibliografiskt granskad

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