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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.20: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Electronic and structural properties of two novel Palladium-based Heusler superconductors. — •Jürgen Winterlik, Gerhard H. Fecher, and Claudia Felser — Institut für Anorganische und Analytische Chemie, Johannes Gutenberg - Universität, 55099 Mainz, Germany

This work reports the two novel superconducting Heusler compounds Pd₂ZrAl and Pd₂HfAl. Magnetization and resistance measurements were carried out to verify their transitions to the superconducting states. The compounds exhibit transition temperatures of 3.2 K for Pd₂ZrAl and 3.4 K for Pd₂HfAl. From their behavior in external magnetic fields, it was determined that both compounds are type II superconductors. Similar to the half-metallic ferromagnets, the superconducting Heusler compounds follow an electron counting scheme based on theoretical considerations, the van Hove scenario. As found from ab initio calculations, the superconductivity can be explained by a valence instability at the L-point, that has been used as design criterion.