A minimum single-band model for low-energy excitations in superconducting AxFe2-ySe2

被引：5

作者：

Zhou, T. ^{[1
,2
,3
]}

Wang, Z. D. ^{[2
,3
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Sci, Nanjing 210016, Peoples R China

[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[3] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL B | 2012年 / 85卷 / 07期

关键词：

Topology - Iron compounds - Neutron scattering - Iron-based Superconductors;

D O I：

10.1140/epjb/e2012-30315-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We propose a phenomenological single-band model for the newly discovered iron-selenide superconductors A(x)Fe(2-y)Se(2) (A = Tl, K, Rb, Cs). Based on this minimum model and the random phase approximation, the d(x2-y2) pairing symmetry is revealed theoretically, which may be understood in the framework of Fermi surface topology. A common origin of superconductivity is elucidated for this compound and other high-T-c materials. The spin excitations at (pi, pi/2) in superconducting states are observed, in good agreement with the neutron scattering experiments. The spin resonance is indicated to show up only for the d-wave pairing, which provides an additional indication for the d-wave pairing symmetry in this family of superconductors.

引用

页数：7

共 43 条

[1] A Novel Large Moment Antiferromagnetic Order in K0.8Fe16Se2 Superconductor [J].

Bao Wei ;

Huang Qing-Zhen ;

Chen Gen-Fu ;

Green, M. A. ;

Wang Du-Ming ;

He Jun-Bao ;

Qiu Yi-Ming .

CHINESE PHYSICS LETTERS, 2011, 28 (08)

[2] Slave boson approach to neutron scattering in YBa2Cu3O6+y superconductors [J].

Brinckmann, J ;

Lee, PA .

PHYSICAL REVIEW LETTERS, 1999, 82 (14) :2915-2918

[3] Electronic Structure of KFe2Se2 from First-Principles Calculations [J].

Cao Chao ;

Dai Jian-Hui .

CHINESE PHYSICS LETTERS, 2011, 28 (05)

[4] Electronic Identification of the Parental Phases and Mesoscopic Phase Separation of KxFe2-ySe2 Superconductors [J].

Chen, F. ;

Xu, M. ;

Ge, Q. Q. ;

Zhang, Y. ;

Ye, Z. R. ;

Yang, L. X. ;

Jiang, Juan ;

Xie, B. P. ;

Che, R. C. ;

Zhang, M. ;

Wang, A. F. ;

Chen, X. H. ;

Shen, D. W. ;

Hu, J. P. ;

Feng, D. L. .

PHYSICAL REVIEW X, 2011, 1 (02) :1-8

[5] Stripes, spin resonance, and nodeless d-wave pairing symmetry in Fe2Se2-based layered superconductors [J].

Das, Tanmoy ;

Balatsky, A. V. .

PHYSICAL REVIEW B, 2011, 84 (01)

[6] Robustness of s-Wave Pairing in Electron-Overdoped A1-yFe2-xSe2 (A = K, Cs) [J].

Fang, Chen ;

Wu, Yang-Le ;

Thomale, Ronny ;

Bernevig, B. Andrei ;

Hu, Jiangping .

PHYSICAL REVIEW X, 2011, 1 (01) :1-13

[7] Fe-based superconductivity with Tc=31 K bordering an antiferromagnetic insulator in (Tl,K) FexSe2 [J].

Fang, Ming-Hu ;

Wang, Hang-Dong ;

Dong, Chi-Heng ;

Li, Zu-Juan ;

Feng, Chun-Mu ;

Chen, Jian ;

Yuan, H. Q. .

EPL, 2011, 94 (02)

[8] Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of RbxFe2-ySe2 single crystals [J].

Friemel, G. ;

Park, J. T. ;

Maier, T. A. ;

Tsurkan, V. ;

Li, Yuan ;

Deisenhofer, J. ;

von Nidda, H. -A. Krug ;

Loidl, A. ;

Ivanov, A. ;

Keimer, B. ;

Inosov, D. S. .

PHYSICAL REVIEW B, 2012, 85 (14)

[9] Superconductivity in the iron selenide KxFe2Se2 (0 ≤x≤1.0) [J].

Guo, Jiangang ;

Jin, Shifeng ;

Wang, Gang ;

Wang, Shunchong ;

Zhu, Kaixing ;

Zhou, Tingting ;

He, Meng ;

Chen, Xiaolong .

PHYSICAL REVIEW B, 2010, 82 (18)

[10] A generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductors [J].

Han, Q. ;

Chen, Y. ;

Wang, Z. D. .

EPL, 2008, 82 (03)

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