Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-18
Scientific Reports 1, 115 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
We report inelastic neutron scattering experiments on single crystals of superconducting Ba0.67K0.33Fe2As2 (Tc = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spin excitations in the normal state form longitudinally elongated ellipses along the QAFM direction in momentum space, consistent with density functional theory predictions. On cooling below Tc, while the resonance preserves its momentum anisotropy as expected, spin excitations at energies below the resonance become essentially isotropic in the in-plane momentum space and dramatically increase their correlation length. These results suggest that the superconducting gap structures in Ba0.67Ka0.33Fe2As2 are more complicated than those suggested from angle resolved photoemission experiments.
Abernathy D. L.
Chang Sung
Chi Songxue
Dai Pengcheng
Hu Jiangping
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