Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2

Details Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2 Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2

2011-06-03

arxiv.org/abs/1106.0771v1

Physical Review Letters 107, 177003 (2011)

Physics

Condensed Matter

Superconductivity

4 pages 4 figures

Scientific paper

10.1103/PhysRevLett.107.177003

We report inelastic neutron scattering measurements of the resonant spin excitations in Ba1-xKxFe2As2 over a broad range of electron band filling. The fall in the superconducting transi- tion temperature with hole doping coincides with the magnetic excitations splitting into two incom- mensurate peaks because of the growing mismatch in the hole and electron Fermi surface volumes, as confirmed by a tight-binding model with s+- symmetry pairing. The reduction in Fermi surface nesting is accompanied by a collapse of the resonance binding energy and its spectral weight caused by the weakening of electron-electron correlations.

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