mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-220Research ArticleСтатьиPolaron effects in extended Hubbard model (in English)EreminI.

Berlin

EreminM. V.

420008 Kazan

Institut für Theoretische Physik Freie UniversitätGermanyPhysics Department, Kazan State UniversityRussian Federation20042201202461Special Issue2132Copyright © Eremin I., Eremin M.V., 20242024Eremin I., Eremin M.V.Eremin I., Eremin M.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/220

Starting from the three-band p-d Hubbard Hamiltonian we derive the effective t-J model Hamiltonian including electron-phonon interaction of quasiparticles with optical phonons and strong electron correlations. We consider two possible cases when the carriers move over the oxygen sites and also if the they move over the copper sublattice. Most importantly, we find that the phonon renormalization of t is quite different in both cases. Within an effective Hamiltonian we analyze the influence of phonons on the dynamical spin susceptibility in layered cuprates. For example, we find an isotope effect on resonance peak in the magnetic spin susceptibility, Im\chi(q,\omega), seen by inelastic neutron scattering. It experimental observation would be a strong argument in favor of polaronic character of the carrier motion in layered cuprates.

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The authors declare that there are no conflicts of interest present.