Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2.

Christianson, A D; Lumsden, M D; Nagler, S E; MacDougall, G J; McGuire, M A; Sefat, A S; Jin, R; Sales, B C; Mandrus, D

Christianson, A D; Lumsden, M D; Nagler, S E; MacDougall, G J; McGuire, M A; Sefat, A S; Jin, R; Sales, B C; Mandrus, D.

Afiliación

Christianson AD; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

Phys Rev Lett ; 103(8): 087002, 2009 Aug 21.

Article en En | MEDLINE | ID: mdl-19792749

RESUMEN

We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through TC. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below TC additional intensity appears at an energy of approximately 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 TC 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.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2009 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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