Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.23: Poster
Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B
CeRu2Si2 and Quantum Critical Metamagnetism? — •Franziska Weickert1,2, Philipp Gegenwart3,1, Markus Garst4, and Frank Steglich1 — 1Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden — 2Hochfeld-Magnetlabor Dresden, 01328 Dresden — 3I. Physikalisches Institut, Universität Göttingen, 37077 Göttingen — 4Institut für Theoretische Physik, Universität Köln, 50938 Köln
CeRu2Si2 is a well-known prototypical heavy fermion system and shows a sudden strong increase in the magnetization M and the sample length Δ L for magnetic fields parallel to the crystallographic c-direction at around 7.8 T. These anomalies occur below 4 K and sharpen with decreasing temperatures, but no features for a first order phase transition are observed down to 15 mK.
We report new thermal expansion α, magnetostriction λ and specific heat C/T measurements, which have been made in mT magnetic field steps around the metamagnetic crossover down to 15 mK on very pure single crystals.
The results show hints for the existence of a quantum critical end-point in CeRu2Si2 and were compared with an extended model of metamagnetic quantum criticality, which was first introduced by Millis et al. in 2002.