Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb2Fe4Se5 Single Crystals

被引：95

作者：

Park, J. T. ^{[1
]}

Friemel, G. ^{[1
]}

Li, Yuan ^{[1
]}

Kim, J. -H. ^{[1
]}

Tsurkan, V. ^{[2
,3
]}

Deisenhofer, J. ^{[2
]}

von Nidda, H. -A. Krug ^{[2
]}

Loidl, A. ^{[2
]}

Ivanov, A. ^{[4
]}

Keimer, B. ^{[1
]}

Inosov, D. S. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Univ Augsburg, Ctr Elect Correlat & Magnetism, Inst Phys, D-86135 Augsburg, Germany

[3] Moldavian Acad Sci, Inst Appl Phys, MD-2028 Kishinev, Moldova

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 17期

关键词：

GAP; BA0.6K0.4FE2AS2; CS;

D O I：

10.1103/PhysRevLett.107.177005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the low-energy spin-excitation spectrum of the single-crystalline Rb2Fe4Se5 superconductor (T-c = 32 K) by means of inelastic neutron scattering. In the superconducting state, we observe a magnetic resonant mode centered at an energy of (h) over bar omega(res) = 14 meV and at the (0.5 0.25 0.5) wave vector (unfolded Fe-sublattice notation), which differs from the ones characterizing magnetic resonant modes in other iron-based superconductors. Our finding suggests that the 245-iron selenides are unconventional superconductors with a sign-changing order parameter, in which bulk superconductivity coexists with the root 5 X root 5 magnetic superstructure. The estimated ratios of (h) over bar omega(res)/k(B)T(c) approximate to 5.1 +/- 0.4 and (h) over bar omega(res)/2 Delta approximate to 0.7 +/- 0.1, where Delta is the superconducting gap, indicate moderate pairing strength in this compound, similar to that in optimally doped 1111 and 122 pnictides.

引用

页数：5

共 61 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] Block Spin Ground State and Three-Dimensionality of (K, Tl)yFe1.6Se2 [J].

Cao, Chao ;

Dai, Jianhui .

PHYSICAL REVIEW LETTERS, 2011, 107 (05)

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

Cao Chao ;

Dai Jian-Hui .

CHINESE PHYSICS LETTERS, 2011, 28 (05)

[4]

CHARNUKA A, ARXIV11085698

[5]

Chen F, ARXIV11063026

[6] 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)

[7] 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

[8] 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)

[9] Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2 [J].

Ding, H. ;

Richard, P. ;

Nakayama, K. ;

Sugawara, K. ;

Arakane, T. ;

Sekiba, Y. ;

Takayama, A. ;

Souma, S. ;

Sato, T. ;

Takahashi, T. ;

Wang, Z. ;

Dai, X. ;

Fang, Z. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. .

EPL, 2008, 83 (04)

[10] The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors [J].

Eschrig, M .

ADVANCES IN PHYSICS, 2006, 55 (1-2) :47-183

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