Abstract
We have performed muon Knight shift measurements in the heavy-fermion compound ( Ce 1 - x La x ) 2 IrIn 8 , x = 0.1 , in 1 T magnetic field applied along the crystalline c-axis. Although the Knight shift K scales linearly with susceptibility χ above T ∼ 20 K , a breakdown of this relationship was observed below a temperature T * = 20.1 ( 8 ) K . It was found that this Knight shift anomaly occurs due to a low-temperature susceptibility component χ cf ∼ ( 1 - T / T * ) ln ( T * / T ) , corresponding to the formation of a coherent heavy-fermion state below T * , as found previously in the x = 0 compound. The characteristic temperature 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.
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