Infrared spectrum and its implications for the electronic structure of the semiconducting iron selenide K0.83Fe1.53Se2

被引：47

作者：

Chen, Z. G. ^{[1
]}

Yuan, R. H. ^{[1
]}

Dong, T. ^{[1
]}

Xu, G. ^{[1
]}

Shi, Y. G. ^{[1
]}

Zheng, P. ^{[1
]}

Luo, J. L. ^{[1
]}

Guo, J. G. ^{[1
]}

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

Wang, N. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 22期

关键词：

SUPERCONDUCTIVITY; CS;

D O I：

10.1103/PhysRevB.83.220507

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report an infrared spectroscopy study on K0.83Fe1.53Se2, a semiconducting parent compound of the 245 iron selenide superconductors. The major spectral features are found to be distinctly different from all other Fe-based superconducting systems. Our measurement revealed two peculiar spectral structures: a double-peak structure between 4000 and 6000 cm(-1) and abundant phonon modes-much more than expected for a 122 structure. We elaborate that those features could be naturally explained from the blocked antiferromagnetism due to the presence of Fe vacancy ordering as determined by recent neutron-diffraction experiments. The double peaks reflect the coexistence of ferromagnetic and antiferromagnetic couplings between the neighboring Fe sites.

引用

页数：4

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