Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Pinning und Vortexdynamik (1-8), Supraleitung: Theorie (9-13), Korrelierte Elektronen (14-48), Niederdimensionale Systeme (49-68), Quantenflüssigkeiten (69-75)
TT 17.12: Poster
Mittwoch, 29. März 2000, 14:30–18:00, A
Collective Modes and Electronic Raman Scattering in the Cuprates — •Francesca Venturini1, Umberto Michelucci2, Thomas P. Devereaux3, and Arno P. Kampf2 — 1Walther Meissner Institut, 85748 Garching. — 2Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, 86135, Augsburg. — 3Department of Physics, University of Waterloo, Waterloo, On, Canada, N2L 3G1
While the electronic Raman response at low frequencies in the superconducting state in the cuprates can be largely understood in terms of a d-wave energy gap, a long standing problem has been an explanation for the spectra observed in A1g polarization orientations. We present calculations which suggest that the observed A1g peak is due to a collective spin fluctuation mode. We have investigated several models which link our results to the 41 meV neutron resonance.