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, Mercouri 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

Research output: Contribution to journalArticle

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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
Article number177003
JournalPhysical Review Letters
Volume107
Issue number17
DOIs
Publication statusPublished - Oct 18 2011

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Fermi surfaces
excitation
electrons
inelastic scattering
neutron scattering
binding energy
transition temperature
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Castellan, J. P., Rosenkranz, S., Goremychkin, E. A., Chung, D. Y., Todorov, I. S., Kanatzidis, M. G., ... 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

Effect of fermi surface nesting on resonant spin excitations in Ba 1-xKxFe2As2. / Castellan, J. P.; Rosenkranz, S.; Goremychkin, E. A.; Chung, D. Y.; Todorov, I. S.; Kanatzidis, Mercouri G; Eremin, I.; Knolle, J.; Chubukov, A. V.; Maiti, S.; Norman, M. R.; Weber, F.; Claus, H.; Guidi, T.; Bewley, R. I.; Osborn, R.

In: Physical Review Letters, Vol. 107, No. 17, 177003, 18.10.2011.

Research output: Contribution to journalArticle

Castellan, JP, Rosenkranz, S, Goremychkin, EA, Chung, DY, Todorov, IS, Kanatzidis, MG, Eremin, I, Knolle, J, Chubukov, AV, Maiti, S, Norman, MR, Weber, F, Claus, H, Guidi, T, Bewley, RI & Osborn, R 2011, 'Effect of fermi surface nesting on resonant spin excitations in Ba 1-xKxFe2As2', Physical Review Letters, vol. 107, no. 17, 177003. https://doi.org/10.1103/PhysRevLett.107.177003
Castellan, J. P. ; Rosenkranz, S. ; Goremychkin, E. A. ; Chung, D. Y. ; Todorov, I. S. ; Kanatzidis, Mercouri G ; Eremin, I. ; Knolle, J. ; Chubukov, A. V. ; Maiti, S. ; Norman, M. R. ; Weber, F. ; Claus, H. ; Guidi, T. ; Bewley, R. I. ; Osborn, R. / Effect of fermi surface nesting on resonant spin excitations in Ba 1-xKxFe2As2. In: Physical Review Letters. 2011 ; Vol. 107, No. 17.
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