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Metal-insulator transition in manganites: Changes in optical conductivity up to 22 eV

A. Rusydi ; Ralf Rauer (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; G. Neuber ; M. Bastjan ; I. Mahns ; S. Muller ; P. Saichu ; B. Schulz ; S. G. Singer ; A. I. Lichtenstein ; D. Qi ; X. Gao ; X. Yu ; A. T. S. Wee ; G. Stryganyuk ; K. Dorr ; G. A. Sawatzky ; S. L. Cooper ; M. Rubhausen
Physical Review B (1098-0121). Vol. 78 (2008), 12, p. 125110 (art. no.).
[Artikel, refereegranskad vetenskaplig]

The electronic response of doped manganites at the transition from the paramagnetic insulating to the ferromagnetic metallic state in La(1-x)Ca(x)MnO(3) for x=0.3 and 0.2 was investigated by dc conductivity, ellipsometry, and vacuum ultraviolet reflectance for energies between 0 and 22 eV. A stabilized Kramers-Kronig transformation yields the optical conductivity and reveals changes in the optical spectral weight up to 22 eV at the metal-to-insulator transition. In the observed energy range, the spectral weight is conserved within 0.3%. The redistribution of spectral weight in this surprisingly broad energy range has important ramifications for the effective low-energy physics. We discuss the importance of the charge-transfer, Coulomb on-site, Jahn-Teller, and long-range Coulomb screening effects to the electronic structure.

Nyckelord: narrow energy bands, electronic-structure, photoemission spectra, la0.7ca0.3mno3 films, phase-separation, orbital waves, lamno3, la1-xsrxmno3, charge, excitations

Denna post skapades 2013-01-28. Senast ändrad 2013-01-30.
CPL Pubid: 172256


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Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)


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