Doping dependence of the spin excitations in the Fe-based superconductors Fe1+yTe1-xSex

被引：11

作者：

Christianson, A. D. ^{[1
]}

Lumsden, M. D. ^{[1
]}

Marty, K. ^{[1
]}

Wang, C. H. ^{[1
]}

Calder, S. ^{[1
]}

Abernathy, D. L. ^{[1
]}

Stone, M. B. ^{[1
]}

Mook, H. A. ^{[1
]}

McGuire, M. A. ^{[1
]}

Sefat, A. S. ^{[1
]}

Sales, B. C. ^{[1
]}

Mandrus, D. ^{[1
,2
]}

Goremychkin, E. A. ^{[3
,4
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[3] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 OQX, Oxon, England

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.87.224410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Fe1+yTe1-xSex series of materials is one of the prototype families of Fe-based superconductors. To provide further insight into these materials, we present systematic inelastic neutron scattering measurements of the low-energy spin excitations for x = 0.27, 0.36, 0.40, and 0.49. These measurements show an evolution of incommensurate spin excitations towards the (1/2,1/2,0) wave vector with doping. Concentrations (x = 0.40 and 0.49) which exhibit the most robust superconducting properties have spin excitations closest to (1/2,1/2,0) and also exhibit a strong spin resonance in the spin excitation spectrum below T-c. The resonance signal appears to be closer to (1/2,1/2,0) than the underlying spin excitations. We discuss the possible relationship between superconductivity and spin excitations at the (1/2,1/2,0) wave vector and the role that interstitial Fe may play.

引用

页数：7

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