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

被引：62

作者：

Rusydi, A. ^{[1
,2
,3
]}

Rauer, R. ^{[4
]}

Neuber, G. ^{[1
,2
]}

Bastjan, M. ^{[1
,2
]}

Mahns, I. ^{[1
,2
]}

Mueller, S. ^{[1
,2
]}

Saichu, P. ^{[1
,2
]}

Schulz, B. ^{[1
,2
]}

Singer, S. G. ^{[1
,2
]}

Lichtenstein, A. I. ^{[5
]}

Qi, D. ^{[3
]}

Gao, X. ^{[3
]}

Yu, X. ^{[6
]}

Wee, A. T. S. ^{[3
]}

Stryganyuk, G. ^{[7
]}

Doerr, K. ^{[8
]}

Sawatzky, G. A. ^{[9
]}

Cooper, S. L. ^{[10
,11
]}

Ruebhausen, M. ^{[1
,2
]}

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20335 Hamburg, Germany

[2] Ctr Free Electron Laser Sci CFEL, D-22607 Hamburg, Germany

[3] Natl Univ Singapore, Dept Phys, Fac Sci, Singapore 117542, Singapore

[4] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden

[5] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany

[6] Natl Univ Singapore, SSLS, Singapore 117603, Singapore

[7] Univ Hamburg, Inst Expt Phys 2, D-22761 Hamburg, Germany

[8] Zent Inst Festkorperphys & Werkstofforsch, D-01171 Dresden, Germany

[9] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[10] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[11] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.78.125110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

共 55 条

[1] Self-trapped exciton and Franck-Condon spectra predicted in LaMnO3 [J].