Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 4: Symposium Superconducting Cuprates
TT 4.10: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU H104
Fermi-liquid based theory for the in-plane magnetic anisotropy in untwinned cuprates — •Dirk Manske1 and Ilya Eremin2 — 1Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart — 2Freie Universität Berlin, Institut für Theoretische Physik, 14195 Berlin
Using a generalized RPA-type theory we calculate the in-plane anisotropy of the magnetic excitations in hole-doped high-Tc superconductors. Extending our earlier Fermi-liquid based studies on the resonance peak by inclusion of orthorhombicity, we still find two-dimensional spin excitations, however, being strongly anisotropic. This reflects the underlying anisotropy of the hopping matrix elements and of the superconducting gap function. We compare our calculations with experimental date on fully untwinned YBCO (V. Hinkov et al., Nature 2004) and find good agreement. Our results are in contrast to earlier interpretations on the in-plane aniostropy in terms of stripes (H. Mook et al., Nature 2000).