image study of the effects of Ce dilution on the development of the heavy-fermion state in image Original Research Article

We have performed muon Knight shift measurements in the heavy-fermion compound (Ce1-xLax)2IrIn8(Ce1-xLax)2IrIn8, x=0.1x=0.1, in 1 T magnetic field applied along the crystalline c -axis. Although the Knight shift K scales linearly with susceptibility χχ above View the MathML sourceT∼20K, a breakdown of this relationship was observed below a temperature View the MathML sourceT*=20.1(8)K. It was found that this Knight shift anomaly occurs due to a low-temperature susceptibility component χcf∼(1-T/T*)ln(T*/T)χcf∼(1-T/T*)ln(T*/T), corresponding to the formation of a coherent heavy-fermion state below T*T*, as found previously in the x=0x=0 compound. The characteristic temperature T*T* is reduced by about 4 K for 10% La doping, indicating a reduction in the strength of the intersite Ce fluctuations associated with the heavy electron state.