DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2003 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 9: Neue und unkonventionelle Supraleiter

TT 9.3: Talk

Tuesday, March 25, 2003, 10:00–10:15, HSZ301

Composite Spin-Triplet Superconductivity in an SU(2)⊗ SU(2) Symmetric Lattice Model — •Frithjof Anders — Institut für Festkörperphysik, Technische Universität Darmstadt, Hochschulstr.8, 64289 Darmstadt

The two-channel Anderson lattice model which has SU(2)⊗ SU(2) symmetry is of relevance to understanding of the magnetic, quadrupolar and superconducting phases in U1−xThxBe13 or Pr base skutterudite compounds such as PrFe4P12 or PrOs4Sb12. Possible unconventional superconducting phases of the model are explored. They are characterized by a composite order parameter comprising of a local magnetic or quadrupolar moment and a triplet conduction electron Cooper-pair. This binding of local degrees of freedom removes the entropy of the non Fermi-liquid normal state. We find superconducting transitions in the intermediate valence regime which are suppressed in the stable moment regime. The gap function is non analytic and odd in frequency: a pseudo-gap develops in the conduction electron density of states which vanishes as |ω| close to ω=0. In the strong intermediate valent regime, the gap function acquires an additional k-dependence.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2003 > Dresden