Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe0.4Te0.6

被引：206

作者：

Qiu, Yiming ^{[1
,2
]}

Bao, Wei ^{[3
]}

Zhao, Y. ^{[4
,5
]}

Broholm, Collin ^{[1
,4
,5
]}

Stanev, V. ^{[4
,5
]}

Tesanovic, Z. ^{[4
,5
]}

Gasparovic, Y. C. ^{[1
,2
,4
]}

Chang, S. ^{[1
]}

Hu, Jin ^{[6
]}

Qian, Bin ^{[6
]}

Fang, Minghu ^{[6
,7
]}

Mao, Zhiqiang ^{[6
]}

机构：

[1] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[3] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Johns Hopkins Univ, Inst Quantum Matter, Baltimore, MD 21218 USA

[6] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA

[7] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 06期

关键词：

NEUTRON-SCATTERING; MAGNETIC EXCITATIONS; MODE; BA0.6K0.4FE2AS2; COMPOUND; SYSTEM; LIFEAS; FEAS;

D O I：

10.1103/PhysRevLett.103.067008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (T-c = 14 K). Low energy spin fluctuations are found with a characteristic wave vector (1/2 1/2 L) that corresponds to Fermi surface nesting and differs from Q(m) = (delta 01/2) for magnetic ordering in Fe1+yTe. A spin resonance with h Omega(0) = 6.51(4) meV approximate to 5.3k(B)T(c) and h Gamma = 1.25(5) meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s(+/-) superconductivity and imperfect quasi-2D Fermi surface nesting.

引用

页数：4

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