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

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

Research output: Contribution to journalArticlepeer-review


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 ∼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.

Original languageEnglish (US)
Article number087002
JournalPhysical review letters
Issue number8
StatePublished - Aug 19 2009
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


Dive into the research topics of 'Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2'. Together they form a unique fingerprint.

Cite this