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Abstract:
We use high-resolution dilatometry and electrical resistivity down to 20 mK and millitesla magnetic field steps to search for a possible quantum critical (end-) point (QC(E)P) in CeRu22(Si1-x1-xGexx)22 with x=0.00x=0.00 and 0.02 at the metamagnetic transition (MMT), Bm=7.8Bm=7.8 and 6.8 T, respectively. We do not find any evidence for QCEP since (i) the peak height and FWHM of the magnetostrictive anomaly saturate below 0.2 K and (ii) the thermal expansion and the electrical resistivity indicate the formation of a Landau–Fermi liquid (LFL) state below 0.3 K even at B=BmB=Bm. We speculate that the metamagnetic crossover represents a Fermi surface reconstruction that is fully completed below 0.2 K.
