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

J. -P. Castellan; S. Rosenkranz; E. A. Goremychkin; D. Y. Chung; I. S. Todorov; M. G. Kanatzidis; I. Eremin; J. Knolle; A. V. Chubukov; S. Maiti; M. R. Norman; F. Weber; H. Claus; T. Guidi; R. I. Bewley; R. Osborn

doi:10.1103/PhysRevLett.107.177003

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

Superconductivity 2011-12-22 v1 Strongly Correlated Electrons

Authors: J. -P. Castellan , S. Rosenkranz , E. A. Goremychkin , D. Y. Chung , I. S. Todorov , M. G. Kanatzidis , I. Eremin , J. Knolle , A. V. Chubukov , S. Maiti , M. R. Norman , F. Weber , H. Claus , T. Guidi , R. I. Bewley , R. Osborn

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Abstract

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.

Keywords

resonant spin excitations Fermi surface nesting Ba1-xKxFe2As2 inelastic neutron scattering superconducting transition temperature incommensurate peaks electron-electron correlations

Cite

@article{arxiv.1106.0771,
  title  = {Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2},
  author = {J. -P. Castellan and S. Rosenkranz and E. A. Goremychkin and D. Y. Chung and I. S. Todorov and M. G. Kanatzidis and I. Eremin and J. Knolle and A. V. Chubukov and S. Maiti and M. R. Norman and F. Weber and H. Claus and T. Guidi and R. I. Bewley and R. Osborn},
  journal= {arXiv preprint arXiv:1106.0771},
  year   = {2011}
}

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4 pages 4 figures

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

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