We have investigated, using small angle neutron scattering (SANS), polyacrylamide microgels with 0.25% and 1.5% (w/w) cross-linking percentages. The SANS patterns consist of solution-like concentration fluctuations given by two Lorentz functions and a contribution at low q of the type...

Heavy-fermion formation in transition metals and transition-metal oxides is reviewed and compared to observations in canonical f-derived heavy-fermion systems. The work focuses on the dynamic susceptibilities which reveal a characteristic temperature and frequency dependence and which can be...