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We report neutron diffraction experiments performed in the tetragonalantiferromagnetic heavy fermion system CeRhIn$_{5-x}$Sn$_{x}$ in its ($x$, $T$)phase diagram up to the vicinity of the critical concentration $x_c$ $\approx$0.40, where long range magnetic order is suppressed. The propagation vector ofthe magnetic structure is found to be $\bf{k_{IC}}$=(1/2, 1/2, $k_l$) with$k_l$ increasing from $k_l$=0.298 to $k_l$=0.410 when $x$ increases from $x$=0to $x$=0.26. Surprisingly, for $x$=0.30, the order has changed drastically anda commensurate antiferromagnetism with $\bf{k_{C}}$=(1/2, 1/2, 0) is found.This concentration is located in the proximity of the quantum critical pointwhere superconductivity is expected.

Switching of the magnetic order in CeRhIn$_{5-x}$Sn$_{x}$ in the vicinity of its quantum critical point