2011/06/03 by J. -P. Castellan, J. P. Castellan, S. Rosenkranz +23 · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.107.177003
published as Physical Review Letters 107, 177003 (2011) · 4 pages 4 figures
arxiv created 2011/06/03 · openalex publication_date 2011/10/18 · arxiv updated 2011/12/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report inelastic neutron scattering measurements of the resonant spin excitations in Ba(1-x)K(x)Fe(2)As(2) over a broad range of electron band filling. The fall in the superconducting transition temperature with hole doping coincides with the magnetic excitations splitting into two incommensurate 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.