Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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 Weickert^1,2, Philipp Gegenwart^3,1, 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.