Search for a quantum critical end-point in CeRu2(Si1-xGex)2

We use high-resolution dilatometry and electrical resistivity down to 20mK and millitesla magnetic field steps to search for a possible quantum critical (end-) point (QC(E)P) in CeRu2(Si1-xGex)2 with x=0.00 and 0.02 at the metamagnetic transition (MMT), Bm=7.8 and 6.8T, respectively. We do not find any evidence for QCEP since (i) the peak height and FWHM of the magnetostrictive anomaly saturate below 0.2K and (ii) the thermal expansion and the electrical resistivity indicate the formation of a Landau-Fermi liquid (LFL) state below 0.3K even at B=Bm. We speculate that the metamagnetic crossover represents a Fermi surface reconstruction that is fully completed below 0.2K