2007/01/15 by Andrivo Rusydi, R. Rauer, Rusydi, A. +23
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.cond-mat/0701348
openalex publication_date 2007/01/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The electronic response of doped manganites at the transition from the paramagnetic insulating to the ferromagnetic metallic state in \rm La1-xCaxMnO3 for \rm (x=0.3,0.2) was investigated by dc conductivity, ellipsometry, and VUV reflectance for energies between 0 and 24 eV. A stablized Kramers-Kronig transformation yields the optical conductivity and reveals changes in the optical spectral weight up to 24 eV at the metal to insulator transition. In the observed energy range, the spectral weight is conserved within \rm 0.3 %. The redistribution of spectral weight between low and high energies has important ramifications for the down-folding of low-energy Hamiltonians. We discuss the importance of the charge-transfer, Coulomb onsite, Jahn-Teller, and screening effects to the electronic structure.