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

doi:10.1103/PhysRevLett.107.177003

Effect of fermi surface nesting on resonant spin excitations in Ba _1-xK_xFe₂As₂

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

Physics and Astronomy (Twin Cities)

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Abstract

We report inelastic neutron scattering measurements of the resonant spin excitations in Ba_1-xK_xFe₂As₂ 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 language	English (US)
Article number	177003
Journal	Physical review letters
Volume	107
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.107.177003
State	Published - Oct 18 2011

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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-xK_xFe₂As₂. Physical review letters, 107(17), Article 177003. https://doi.org/10.1103/PhysRevLett.107.177003

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-xK_xFe₂As₂', Physical review letters, vol. 107, no. 17, 177003. https://doi.org/10.1103/PhysRevLett.107.177003

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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.",

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AU - Chung, D. Y.

AU - Todorov, I. S.

AU - Kanatzidis, M. G.

AU - Eremin, I.

AU - Knolle, J.

AU - Chubukov, A. V.

AU - Maiti, S.

AU - Norman, M. R.

AU - Weber, F.

AU - Claus, H.

AU - Guidi, T.

AU - Bewley, R. I.

AU - Osborn, R.

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AB - 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.

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Effect of fermi surface nesting on resonant spin excitations in Ba _1-xK_xFe₂As₂

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