mu+SR observation of magnetic ordering and non-Fermi liquid scaling in CeCoGe1.8Si1.2

Muon spin relaxation investigations of CeCoGe1.8Si1.2, which is close to a quantum critical concentration, show magnetic ordering in a volume fraction of similar to 50% with a transition temperature of similar to 0.5 K. The z ero-field relaxation rate lambda(f) of this fraction exhibits a power law o f temperatures between 0.7 and 1 K, where the specific heat to temperature ratio (C/T) scales with log T, and possibly demonstrate non-fermi liquid (N FL) scaling. We suggest that the disorder which introduces inhomogenities i n Kondo temperatures and RKKY coupling strengths of Ce ions as a possible o rigin of NFL behaviour in this ahoy. (C) 1999 Elsevier Science B.V. All rig hts reserved.