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The effects of anisotropy and Yb–Yb interactions on the low-field electron spin resonance in Yb2Rh2Si2 and YbIr2Si2

The effect of anisotropy on the low-field electron spin resonance in the Kondo lattice compounds YbRh2Si2 and YbIr2Si2 is assessed. It is shown that the g-shift in YbRh2Si2 is a consequence of the anisotropy in the Yb–Yb interactions as mirrored in the molecular field parameters characterizing the resonant susceptibility. It is also pointed out that the large residual linewidth for YbIr2Si2 results from the modification of the Korringa contribution that occurs when the Curie susceptibility of the isolated ion is replaced by the resonant susceptibility with an experimentally determined molecular field parameter.