Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 15: Postersitzung II: Elektronische Eigenschaften (1-12), Josephson-Kontakte (13-27), Heavy Fermions (28-40), Theorie HTSL (41-48), M-I-Überg
änge, Korrelierte Systeme (49-79)

TT 15.8: Poster

Wednesday, March 24, 1999, 14:30–18:00, Foy

The microscopic spin-phonon coupling constants in CuGeO₃ — •R. Werner¹, C. Gros¹, and M. Braden² — ¹Institut für Physik, Universität Dortmund, 44221 Dortmund, Germany. — ²Forschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik, Postfach 3640, 76021 Karlsruhe, Germany and Laboratoire Léon Brillouin (CEA-CNRS), Centre d’Études Nucléaires de Saclay, 91191 Gif-sur-Yvette Cédex, France.

Using RPA results, mean field theory, and refined data for the polarization vectors we determine the coupling constants of the four Peierls-active phonon modes to the spin chains. We then derive the values of the coupling of the spin system to the linear ionic displacements, the bond lengths and the angles between bonds. Our values are consistent with microscopic theories and various experimental results.