Effect of fermi surface nesting on resonant spin excitations in Ba 1-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

*Corresponding author for this work

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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 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.

Original languageEnglish (US)
Article number177003
JournalPhysical review letters
Volume107
Issue number17
DOIs
StatePublished - Oct 18 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Castellan, J. P., Rosenkranz, S., Goremychkin, E. A., Chung, D. Y., Todorov, I. S., Kanatzidis, M. G., Eremin, I., Knolle, J., Chubukov, A. V., Maiti, S., Norman, M. R., Weber, F., Claus, H., Guidi, T., Bewley, R. I., & Osborn, R. (2011). Effect of fermi surface nesting on resonant spin excitations in Ba 1-xKxFe2As2. Physical review letters, 107(17), [177003]. https://doi.org/10.1103/PhysRevLett.107.177003