Core-level and valence-band study using angle-integrated photoemission on LaFeAsO0.9F0.1

被引：15

作者：

Garcia, D. R. ^{[1
,2
]}

Jozwiak, C. ^{[1
]}

Hwang, C. G. ^{[2
]}

Fedorov, A. ^{[3
]}

Hanrahan, S. M. ^{[4
]}

Wilson, S. D. ^{[2
]}

Rotundu, C. R. ^{[2
]}

Freelon, B. K. ^{[2
]}

Birgeneau, R. J. ^{[1
,2
]}

Bourret-Courchesne, E. ^{[2
]}

Lanzara, A. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 24期

基金：

美国国家科学基金会;

关键词：

electron correlations; electronic density of states; high-temperature superconductors; iron compounds; lanthanum compounds; photoelectron spectra; solid-state phase transformations; superconducting transitions; valence bands;

D O I：

10.1103/PhysRevB.78.245119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using angle-integrated photoemission spectroscopy we have probed the novel LaFeAsO0.9F0.1 superconductor over a wide range of photon energies and temperatures. We have provided a full characterization of the orbital character of the valence-band (VB) density of states (DOS) and of the magnitude of the d-p hybridization energy. Finally, we have identified two characteristic temperatures: 90 K where a pseudogap-like feature appears to close and 120 K where a sudden change in the DOS near E-F occurs. We associate these phenomena with the spin density wave magnetic ordering and the structural transition seen in the parent compound, respectively. These results suggest the important role of electron correlation, spin physics, and structural distortion in the physics of Fe-based superconductors.

引用

页数：6

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