Optical investigation of the electronic structures of Y2Ru2O7, CaRuO3, SrRuO3, and Bi2Ru2O7 -: art. no. 245107

被引:80
作者
Lee, JS [1 ]
Lee, YS
Noh, TW
Char, K
Park, J
Oh, SJ
Park, JH
Eom, CB
Takeda, T
Kanno, R
机构
[1] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea
[2] Seoul Natl Univ, Res Ctr Oxide Elect, Seoul 151747, South Korea
[3] Seoul Natl Univ, Ctr Strongly Correlated Mat Res, Seoul 151747, South Korea
[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
[5] Pohang Univ Sci & Technol, Electron Spin Sci Ctr, Pohang 790784, South Korea
[6] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA
[7] Kobe Univ, Dept Chem, Kobe, Hyogo 657, Japan
关键词
D O I
10.1103/PhysRevB.64.245107
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigated the electronic structures of the bandwidth-controlled ruthenates, Y2Ru2O7, CaRuO3, SrRuO3, and Bi2Ru2O7, by optical conductivity analysis in a wide energy region of 5 meV-12 eV. We could assign optical transitions from the systematic changes of the spectra and by comparison with the O 1s x-ray absorption data. We estimated some physical parameters, such as the on-site Coulomb repulsion energy and the crystal-field splitting energy. These parameters show that the 4d orbitals should be more extended than 3d ones. These results are also discussed in terms of the Mott-Hubbard model.
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页数:6
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