Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.11: Poster
Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B
Ambient-pressure thermodynamic measurements on UGe2 — •Frédéric Hardy1,2, Christoph Meingast1, Hilbert v. Löhneysen1,2, Jacques Flouquet3, Andrew Huxley3, Jason Lashley4, Robert A. Fisher5, and Norman E. Phillips5 — 1Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany — 3SPSMS-DRFMC, CEA-Grenoble, 38054 Grenoble cedex, France — 4Materials Science Division and Technology Division, LANL, Los Alamos, New Mexico 87545, USA — 5Materials Science Division, LBNL, Berkeley, California 94720, USA
The pairing interaction leading to the formation of the Cooper pairs remains unidentified in the ferromagnetic superconductor UGe2. Nevertheless, there is strong experimental evidence that superconductivity is not mediated by the magnetic fluctuations that drive TCurie(p) to zero; it rather appears closely related to another phase boundary Tx(p) that occurs at lower pressure. Theoretical works suggested that this additional phase boundary could arise either from a coupling between SDW and CDW orderings or from a peak in the electronic density of states. Although the existence of this anomaly is experimentally incontestable between 0.6 and 1.2 GPa, the situation at ambient pressure remains ambiguous. We discuss the aforementioned scenarios in the light of recent high-resolution thermal expansion and calorimetric measurements realized under high magnetic fields at ambient pressure.