Static and Dynamic Magnetism in Underdoped Superconductor BaFe1.92Co0.08As2

被引：144

作者：

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

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

Nagler, S. E. ^{[1
]}

MacDougall, G. J. ^{[1
]}

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

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

Jin, R. ^{[1
]}

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

Mandrus, D. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.103.087002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through T-C. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below T-C additional intensity appears at an energy of similar to 4.5(0.5) meV, similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below T-C for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance, demonstrating the direct competition between static magnetic order and superconductivity.

引用

页数：4

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