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TT: Tiefe Temperaturen

TT 7: Korrelierte Elektronen: Schwere Fermionen

TT 7.3: Vortrag

Montag, 8. März 2004, 15:00–15:15, H19

Theory for Coexistence of Superconductivity and A-phase in CeCu₂Si₂ — •Matthias Neef and Gertrud Zwicknagl — Institut für Mathematische Physik, TU Braunschweig, Mendelsonstr.3, 38106 Braunschweig

We study the interplay between superconductivity and spin density waves in CeCu₂Si₂. We adopt realistic quasiparticle bands as calculated by means of Renormalized band method. The experimental data concerning the magnetic structure are confirmed. In addition we investigate the superconductivity states, which can either coexist with or expel the A-phase. Results are reported for magnetic susceptibility and thermodynamic properties. The phase diagram is discussed.