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

共 23 条

[21] Electron correlation in the FeSe superconductor studied by bulk-sensitive photoemission spectroscopy
Yamasaki, A.
Matsui, Y.
Imada, S.
Takase, K.
Azuma, H.
Muro, T.
Kato, Y.
Higashiya, A.
Sekiyama, A.
Suga, S.
Yabashi, M.
Tamasaku, K.
Ishikawa, T.
Terashima, K.
Kobori, H.
Sugimura, A.
Umeyama, N.
Sato, H.
Hara, Y.
Miyagawa, N.
Ikeda, S. I.
[J]. PHYSICAL REVIEW B, 2010, 82 (18)
[22] Evidence for weak electronic correlations in iron pnictides
Yang, W. L.
Sorini, A. P.
Chen, C-C.
Moritz, B.
Lee, W-S
Vernay, F.
Olalde-Velasco, P.
Denlinger, J. D.
Delley, B.
Chu, J-H
Analytis, J. G.
Fisher, I. R.
Ren, Z. A.
Yang, J.
Lu, W.
Zhao, Z. X.
van den Brink, J.
Hussain, Z.
Shen, Z-X
Devereaux, T. P.
[J]. PHYSICAL REVIEW B, 2009, 80 (01):
[23] Electronic Structure of Superconducting FeSe Studied by High-Resolution Photoemission Spectroscopy
Yoshida, Rikiya
Wakita, Takanori
Okazaki, Hiroyuki
Mizuguchi, Yoshikazu
Tsuda, Shunsuke
Takano, Yoshihiko
Takeya, Hiroyuki
Hirata, Kazuto
Muro, Takayuki
Okawa, Mario
Ishizaka, Kyoko
Shin, Shik
Harima, Hisatomo
Hirai, Masaaki
Muraoka, Yuji
Yokoya, Takayoshi
[J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2009, 78 (03)

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