Journal
PHYSICAL REVIEW B
Volume 78, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.125110
Keywords
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Funding
- DFG [RU773/3-1, RU773/3-2, GRK 1286]
- HGF [VHZ-007]
- Advanced Functional Materials [R-263-000-432646]
- National University of Singapore
- Canadian Natural Science and Engineering Council
- Foundation for Innovation
- Institute for Advanced Research
- U. S. Department of Energy
- Division of Materials Sciences [DE-FG02-07ER46453]
- NUS Core [C-380-003- 003-001, A*STAR/MOE RP 3979908M, A*STAR 12 105 0038]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46453] Funding Source: U.S. Department of Energy (DOE)
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The electronic response of doped manganites at the transition from the paramagnetic insulating to the ferromagnetic metallic state in La1-xCaxMnO3 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.
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