Evolution of the heavy fermion state in Ce2IrIn8

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We report muon spin rotation Knight shift and susceptibility studies for 1 T applied field along the crystalline c- and a-axes of the heavy fermion compound Ce2IrIn8. Below a characteristic temperature T* one observes a `Knight-shift anomaly' in which the Knight shift constant K no longer scales linearly with susceptibility chi. This anomaly is consistent with a scaling law in which chi is composed of a high-temperature component corresponding to non-interacting local moments and a low-temperature component chicf proportional to (1-T/T*)(T*/T) which characterizes the heavy-electron state below T*. We find that T* is anisotropic, with Tₐ* = 59(3)K and Tc* = 24(1)K, and derive the magnitudes of chicf for H along the a- and c-axes.