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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: FS: Quantum Criticality in Strongly Correlated Metals

TT 21.5: Topical Talk

Mittwoch, 24. März 2010, 12:20–13:00, H20

Novel electronic states near discontinous quantum phase transitions — •Philipp Gegenwart — I. Physikalisches Institut, Georg-August Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen

The collective low-energy excitations near quantum phase transitions (QPTs) lead to novel phenomena such as non-Fermi liquid (NFL) behavior, unconventional superconductivity or electronic nematicity. Here we focus on cubic (Sr1−xCaxRuO3) and layered (Sr3Ru2O7) ruthenates. The former system, studied using thin films, displays a discontinuous ferromagnetic QPT with an extended NFL phase. In the latter system a novel phase displaying nematic-like transport anisotropies, which is bounded in magnetic field by two first-order metamagnetic transitions, is investigated by capacitive dilatometry on high-quality single crystals.

Work in collaboration with M. Schneider, C. Stingl, M. Schubert, K. Winzer, Y. Tokiwa, V. Mosneaga, F. Weickert, A.P. Mackenzie and M. Garst. Financial support by the DFG through SFB 602 and research unit 960 (Quantum phase transitions) is acknowledged.

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