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

Abstract

We report neutron diffraction experiments performed in the tetragonal antiferromagnetic 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 of the magnetic structure is found to be ${\mathbf{k}}_{\mathbf{IC}}$=(1/2, 1/2, $k_l$) with $k_l$ increasing from $k_l$=0.298 to $k_l$=0.410 when $x$ increases from $x$=0 to $x$=0.26. Surprisingly, for $x$=0.30, the order has changed drastically and a commensurate antiferromagnetism with ${\mathbf{k}}_{\mathbf{C}}$=(1/2, 1/2, 0) is found. This concentration is located in the proximity of the quantum critical point where superconductivity is expected.

5 pages, 5 figures, submitted to Phys. Rev. B

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• Evolution of magnetism in Pd-substituted Ce${}_2$RhIn${}_8$ single crystals
• Tuning the pressure-induced superconductivity in Pd-substituted CeRhIn5