Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

Details Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2 Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

2008-11-28

arxiv.org/abs/0811.4755v2

Physical Review Letters 102, 107005 (2009)

Physics

Condensed Matter

Superconductivity

Include additional data showing dispersion

Scientific paper

10.1103/PhysRevLett.102.107005

Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wavevector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c-axis, indicating that the magnetic fluctuations are two-dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds.

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