Incommensurate Spin Fluctuations in Hole-Overdoped Superconductor KFe2As2

被引：72

作者：

Lee, C. H. ^{[1
,2
]}

Kihou, K. ^{[1
,2
]}

Kawano-Furukawa, H. ^{[3
]}

Saito, T. ^{[4
]}

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

Eisaki, H. ^{[1
,2
]}

Fukazawa, H. ^{[2
,4
]}

Kohori, Y. ^{[2
,4
]}

Suzuki, K. ^{[2
,5
]}

Usui, H. ^{[5
]}

Kuroki, K. ^{[2
,5
]}

Yamada, K. ^{[6
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[2] JST, Transformat Res Project Iron Pnictides, Chiyoda Ku, Tokyo 1020075, Japan

[3] Ochanomizu Univ, GSHS, Div Nat Appl Sci, Bunkyo Ku, Tokyo 1128610, Japan

[4] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[5] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan

[6] Tohoku Univ, WPI, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 06期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevLett.106.067003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A neutron scattering study of heavily hole-overdoped superconducting KFe2As2 revealed a well-defined low-energy incommensurate spin fluctuation at [pi(1 +/- 2 delta), 0] with delta = 0.16. The incommensurate structure differs from the previously observed commensurate peaks in electron-doped AFe(2)As(2) (A = Ba, Ca, or Sr) at low energies. The direction of the peak splitting is perpendicular to that observed in Fe(Te, Se) or in Ba(Fe, Co)(2)As-2 at high energies. A band structure calculation suggests interband scattering between bands around the Gamma and X points as an origin of this incommensurate peak. The perpendicular direction of the peak splitting can be understood within the framework of multiorbital band structure. The results suggest that spin fluctuation is more robust in hole-doped than in electron-doped samples, which can be responsible for the appearance of superconductivity in the heavily hole-doped samples.

引用

页数：4

共 27 条

[1] Inelastic Neutron-Scattering Measurements of a Three-Dimensional Spin Resonance in the FeAs-Based BaFe1.9Ni0.1As2 Superconductor [J].

Chi, Songxue ;

Schneidewind, Astrid ;

Zhao, Jun ;

Harriger, Leland W. ;

Li, Linjun ;

Luo, Yongkang ;

Cao, Guanghan ;

Xu, Zhu'an ;

Loewenhaupt, Micheal ;

Hu, Jiangping ;

Dai, Pengcheng .

PHYSICAL REVIEW LETTERS, 2009, 102 (10)

[2] Unconventional superconductivity in Ba0.6K0.4Fe2As2 from inelastic neutron scattering [J].

Christianson, A. D. ;

Goremychkin, E. A. ;

Osborn, R. ;

Rosenkranz, S. ;

Lumsden, M. D. ;

Malliakas, C. D. ;

Todorov, I. S. ;

Claus, H. ;

Chung, D. Y. ;

Kanatzidis, M. G. ;

Bewley, R. I. ;

Guidi, T. .

NATURE, 2008, 456 (7224) :930-932

[3] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[4] Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe2As2 [J].

Dong, J. K. ;

Zhou, S. Y. ;

Guan, T. Y. ;

Zhang, H. ;

Dai, Y. F. ;

Qiu, X. ;

Wang, X. F. ;

He, Y. ;

Chen, X. H. ;

Li, S. Y. .

PHYSICAL REVIEW LETTERS, 2010, 104 (08)

[5]

Fukazawa H., J PHYS SO S IN PRESS

[6] Possible Multiple Gap Superconductivity with Line Nodes in Heavily Hole-Doped Superconductor KFe2AS2 Studied by 75As Nuclear Quadrupole Resonance and Specific Heat [J].

Fukazawa, Hideto ;

Yamada, Yuji ;

Kondo, Kenji ;

Saito, Taku ;

Kohori, Yoh ;

Kuga, Kentarou ;

Matsumoto, Yosuke ;

Nakatsuji, Satoru ;

Kito, Hijiri ;

Shirage, Parasharam M. ;

Kihou, Kunihiro ;

Takeshita, Nao ;

Lee, Chul-Ho ;

Iyo, Akira ;

Eisaki, Hiroshi .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2009, 78 (08)

[7] Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides [J].

Graser, S. ;

Maier, T. A. ;

Hirschfeld, P. J. ;

Scalapino, D. J. .

NEW JOURNAL OF PHYSICS, 2009, 11

[8] Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements [J].

Hashimoto, K. ;

Serafin, A. ;

Tonegawa, S. ;

Katsumata, R. ;

Okazaki, R. ;

Saito, T. ;

Fukazawa, H. ;

Kohori, Y. ;

Kihou, K. ;

Lee, C. H. ;

Iyo, A. ;

Eisaki, H. ;

Ikeda, H. ;

Matsuda, Y. ;

Carrington, A. ;

Shibauchi, T. .

PHYSICAL REVIEW B, 2010, 82 (01)

[9] Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe2As2 Compound of FeAs-Based High-Temperature Superconductors [J].

Huang, Q. ;

Qiu, Y. ;

Bao, Wei ;

Green, M. A. ;

Lynn, J. W. ;

Gasparovic, Y. C. ;

Wu, T. ;

Wu, G. ;

Chen, X. H. .

PHYSICAL REVIEW LETTERS, 2008, 101 (25)

[10] Doping dependence of spin fluctuations and electron correlations in iron pnictides [J].

Ikeda, Hiroaki ;

Arita, Ryotaro ;

Kunes, Jan .

PHYSICAL REVIEW B, 2010, 82 (02)

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