Signatures of Electronic Correlations in Optical Properties of LaFeAsO1-xFx

被引：61

作者：

Boris, A. V. ^{[1
,2
]}

Kovaleva, N. N. ^{[1
,2
]}

Seo, S. S. A. ^{[1
]}

Kim, J. S. ^{[1
]}

Popovich, P. ^{[1
]}

Matiks, Y. ^{[1
]}

Kremer, R. K. ^{[1
]}

Keimer, B. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Univ Loughborough, Dept Phys, Loughborough LE11 3TU, Leics, England

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 02期

关键词：

SUPERCONDUCTIVITY; LAO1-XFXFEAS;

D O I：

10.1103/PhysRevLett.102.027001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spectroscopic ellipsometry is used to determine the dielectric function of superconducting LaFeAsO0.9F0.1 (T-c=27 K) and undoped LaFeAsO polycrystalline samples in the wide range 0.01-6.5 eV at temperatures 10 <= T <= 350 K. The charge carrier response in both samples is heavily damped. The spectral weight transfer in LaFeAsO associated with an opening of the pseudogap at about 0.65 eV is restricted to energies below 2 eV. The spectra of superconducting LaFeAsO0.9F0.1 reveal a significant transfer of spectral weight to a broad optical band above 4 eV with increasing temperature. Our data may imply that the electronic states near the Fermi surface are strongly renormalized due to electron-phonon and/or electron-electron interactions.

引用

页数：4

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