Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.30: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Compressible Quantum Critical Metamagnetistm — •Mario Zacharias¹, Indranil Paul¹, and Markus Garst² — ¹Institute for Theoretical Physics, University of Cologne — ²Institut Neel, CNRS/UJF, Grenoble, France

For materials close to quantum criticality the critical degrees of freedom couple generically to the crystal lattice. In case of perturbative couplings, this results e.g. in a divergent Grüneisen parameter allowing to probe critical fluctuations by measuring elastic properties. We argue however that for quantum critical metamagnetism, as discussed in the context of Sr₃Ru₂O₇ and CeRu₂Si₂, such a coupling is necessarily non-perturbative resulting in a modification of the critical behavior. In particular, we show that the metamagnetic transition is exactly described by mean-field theory without long-range critical fluctuations.