Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 2: Supraleitung: Mechanismen, Phasendiagramm, konkurrierende Ordnungen
TT 2.4: Vortrag
Montag, 8. März 2004, 12:15–12:30, H20
Possible isotope effect on the resonance peak formation in high-Tc cuprates — •Ilya Eremin1, Mikhail Eremin2, and Oleg Kamaev2 — 1Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin — 2Physics Department, Kazan State University, 420008 Kazan, Russian Federation
Within effective t−J Hamiltonian we analyze the influence of electronic correlations and electron-phonon interaction on the dynamical spin susceptibility in layered cuprates. We find an isotope effect on the resonance peak in the magnetic spin susceptibility, Im χ(q,ω), seen by inelastic neutron scattering. It results from both the electron-phonon coupling and the electronic correlation effects taken into account beyond random phase approximation(RPA) scheme. We find at optimal doping the isotope coeffiecient αres ≈ 0.4 which can be further tested experimentally.