Effect of magnetic field on the spin resonance in FeTe0.5Se0.5 as seen via inelastic neutron scattering

被引：45

作者：

Wen, Jinsheng ^{[1
,2
]}

Xu, Guangyong ^{[1
]}

Xu, Zhijun ^{[3
]}

Lin, Zhi Wei ^{[1
]}

Li, Qiang ^{[1
]}

Chen, Ying ^{[4
]}

Chi, Songxue ^{[4
]}

Gu, Genda ^{[1
]}

Tranquada, J. M. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[2] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA

[3] CUNY City Coll, Dept Phys, New York, NY 10031 USA

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 10期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTOR; 43; K; IRON; COMPOUND; ORDER;

D O I：

10.1103/PhysRevB.81.100513

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inelastic neutron scattering and susceptibility measurements have been performed on the optimally doped Fe-based superconductor FeTe0.5Se0.5, which has a critical temperature, T-c of 14 K. The magnetic scattering at the stripe antiferromagnetic wave vector Q=(0.5,0.5) exhibits a "resonance" at similar to 6 meV, where the scattering intensity increases abruptly when cooled below T-c. In a 7-T magnetic field parallel to the a-b plane, T-c is slightly reduced to similar to 12 K, based on susceptibility measurements. The resonance in the neutron-scattering measurements is also affected by the field. The resonance intensity under field cooling starts to rise at a lower temperature similar to 12 K, and the low-temperature intensity is also reduced from the zero-field value. Our results provide clear evidence for the intimate relationship between superconductivity and the resonance measured in magnetic excitations of Fe-based superconductors.

引用

页数：4

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