Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 2: Supraleitung: Mechanismen, Phasendiagramm, konkurrierende Ordnungen
TT 2.1: Hauptvortrag
Montag, 8. März 2004, 11:15–11:45, H20
Neutron scattering investigations of high Tc compounds: what have we learned so far? — •Lothar Pintschovius — Forschungszentrum Karlsruhe, Institut für Festkörperphysik
High Tc compounds have been very extensively studied by neutron scattering. The focus has been on elucidating the spin fluctuations because they are widely considered to mediate high Tc superconductivity. Nevertheless, the experimental characterization of the magnetic fluctuations is still full of gaps for important materials. The available data show that the magnetic excitation spectrum differs profoundly between different classes of materials. Present theories are usually tailored to explain the essential features in only one particular class of compounds.
The phonons were found to change not much from the insulating parent compounds to optimally doped superconductors, with the exception of the plane polarized Cu-O bond-stretching vibrations. It will be discussed in how far the electron-phonon coupling effects seen in the bond-stretching phonons can be linked to anomalies in ARPES spectra or might be associated with dynamic charge order.