Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2

被引：15
|
作者：
Tucker, G. S. [1 ,2 ]
Fernandes, R. M. [3 ]
Pratt, D. K. [1 ,2 ]
Thaler, A. [1 ,2 ]
Ni, N. [1 ,2 ]
Marty, K. [4 ]
Christianson, A. D. [4 ]
Lumsden, M. D. [4 ]
Sales, B. C. [5 ]
Sefat, A. S. [5 ]
Bud'ko, S. L. [1 ,2 ]
Canfield, P. C. [1 ,2 ]
Kreyssig, A. [1 ,2 ]
Goldman, A. I. [1 ,2 ]
McQueeney, R. J. [1 ,2 ]
机构：
[1] US DOE, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
[4] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA
[5] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
来源：
PHYSICAL REVIEW B | 2014年 / 89卷 / 18期
关键词：
HIGH-TEMPERATURE SUPERCONDUCTIVITY;
D O I：
10.1103/PhysRevB.89.180503
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Using inelastic neutron scattering, we show that the onset of superconductivity in underdoped Ba(Fe1-x Co-x) As-2(2) coincides with a crossover from well-defined spin waves to overdamped and diffusive spin excitations. This crossover occurs despite the presence of long-range stripe antiferromagnetic order for samples in a compositional range from x = 0.04 to 0.055, and is a consequence of the shrinking spin-density wave gap and a corresponding increase in the particle-hole (Landau) damping. The latter effect is captured by a simple itinerant model relating Co doping to changes in the hot spots of the Fermi surface. We argue that the overdamped spin fluctuations provide a pairing mechanism for superconductivity in these materials.
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页数：5
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