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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.