Dilution effects in spin 7/2 systems. The case of the antiferromagnet GdRhIn5

•The magnetic properties of the Gd1−xLaxRhIn5(x≤0.50) AFM compounds are discussed.•GdRhIn5 can be modelled by a J=7/2 Heisenberg model on a cubic lattice.•For x≠0, weak disorder can be described through a distribution of transition T.•For larger x, results are not compatible with a classical spin Heisenberg model.•This is a simple 4f (L=0) AFM system for the study of disorder and short range order.

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