X-ray absorption spectroscopy investigation of the electronic structure of superconducting FeSex single crystals

被引：19

作者：

Chen, C. L. ^{[1
]}

Rao, S. M. ^{[1
]}

Dong, C. L. ^{[2
]}

Chen, J. L. ^{[3
,4
]}

Huang, T. W. ^{[1
]}

Mok, B. H. ^{[1
]}

Ling, M. C. ^{[1
]}

Wang, W. C.

Chang, C. L. ^{[3
]}

Chan, T. S. ^{[2
]}

Lee, J. F. ^{[2
]}

Guo, J. -H. ^{[4
]}

Wu, M. K. ^{[1
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[2] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[3] Tamkang Univ, Dept Phys, Tamsui, Taipei Cty, Taiwan

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

来源：

EPL | 2011年 / 93卷 / 04期

关键词：

ALPHA-FESE;

D O I：

10.1209/0295-5075/93/47003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

X-ray absorption spectroscopy (XAS) Fe K-edge spectra of the FeSex (x = 1-0.8) single crystals cleaved in situ under vacuum reveal characteristic Fe 4sp states and a lattice distortion. The Se K-edge spectra point to a strong Fe 3d-Se 4p hybridization giving rise to itinerant charge carriers. A formal charge of similar to 1.8+ for Fe and similar to 2.2- for Se was evaluated from these spectra in the FeSex (x = 0.88). The charge balance between Fe and Se is assigned to itinerant electrons located in the Fe-Se hybridization bond. As x decreases the 4p hole count increases and a crystal structure distortion is observed that in turn causes the Fe separation in the ab-plane change from 4p orbital to varying (modulating) coordination. Powder X-ray diffraction (XRD) measurements also show a slight increase in lattice parameters as x decreases (increasing Se deficiency). Copyright (C) EPLA, 2011

引用

页数：5

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