Metal-insulator transition in manganites: Changes in optical conductivity up to 22 eV
Artikel i vetenskaplig tidskrift, 2008

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.

excitations

electronic-structure

orbital waves

la1-xsrxmno3

la0.7ca0.3mno3 films

charge

narrow energy bands

phase-separation

lamno3

photoemission spectra

Författare

A. Rusydi

Ralf Rauer

Chalmers, 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 - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 78 12 125110 (art. no.)-

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.78.125110