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

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arxiv 1106.0771 v1 pith:GQVBEJWI submitted 2011-06-03 cond-mat.supr-con cond-mat.str-el

J.-P. Castellan , S. Rosenkranz , E. A. Goremychkin , D. Y. Chung , I. S. Todorov , M. G. Kanatzidis , I. Eremin , J. Knolle
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A. V. Chubukov S. Maiti M. R. Norman F. Weber H. Claus T. Guidi R. I. Bewley R. Osborn
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classification cond-mat.supr-concond-mat.str-el
keywords excitationsfermisurfaceba1-xkxfe2as2electronholenestingresonant
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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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