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TT: Fachverband Tiefe Temperaturen
TT 23: CE: Quantum-Critical Phenomena 2
TT 23.7: Talk
Tuesday, March 15, 2011, 12:15–12:30, HSZ 105
Compressible Quantum Critical Metamagnetism — •Mario Zacharias1, Indranil Paul2, and Markus Garst1 — 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Institut Neel, CNRS/UJF, 25 avenue des Martyrs, BP 166, 38042 Grenoble, France
The coupling of critical fluctuations to the crystal lattice results in unusual dilatometric phenomena close to quantum phase transitions like, e.g., a diverging Grüneisen parameter. In certain cases, however, strong critical fluctuations are generically able to induce a distortion of the crystal lattice such that the quantum critical point gets preempted by a first-order structural transition. We argue that this applies for quantum critical metamagnetism as discussed in the context of Sr3Ru2O7 and CeRu2Si2. Within an effective Ginzburg-Landau theory for itinerant quantum critical metamagnetism we discuss the resulting phase diagram and the experimental consequences.