Библиографическое описание:Impurity-Induced Smearing of the Spin Resonance Peak in Fe-Based Superconductors / Y. N. Togushova, V. A. Shestakov, M. M. Korshunov. - Текст : непосредственный // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 481-487. - Cited Reference Count: 25. - Гранты: We acknowledge partial support by the RFBR (Grant 13-02-01395), President Grant for Government Support of the Leading Scientific Schools of the Russian Federation (NSh-2886.2014.2), and The Ministry of education and science of Russia (GF-2, SFU). - Финансирующая организация: RFBR [13-02-01395]; President Grant for Government Support of the Leading Scientific Schools of the Russian Federation [NSh-2886.2014.2]; Ministry of education and science of Russia [GF-2, SFU]. - DEC. - ISSN 0022-2291. - ISSN 1573-7357, DOI 10.1007/s10909-016-1577-x.
Аннотация:The spin resonance peak in the iron-based superconductors is observed in inelastic neutron scattering experiments and agrees well with predicted results for the extended s-wave () gap symmetry. On the basis of four-band and three-orbital tight-binding models we study the effect of nonmagnetic disorder on the resonance peak. Spin susceptibility is calculated in the random-phase approximation with the renormalization of the quasiparticle self-energy due to the impurity scattering in the static Born approximation. We find that the spin resonance becomes broader with the increase of disorder and its energy shifts to higher frequencies. For the same amount of disorder the spin response in the state is still distinct from that of the state.
