Switching of the magnetic order in CeRh$In_{5−x}$$Sn_{x}$ in the vicinity of its quantum critical point

S. Raymond (1) , Jonathan Buhot (2) , E. Ressouche (1) , F. Bourdarot (1) , G. Knebel (3) , G. Lapertot (3)

1 MDN - Magnétisme et Diffusion Neutronique
2 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
3 IMAPEC - Instrumentation, Material and Correlated Electrons Physics

We report neutron diffraction experiments performed in the tetragonal antiferromagnetic heavy fermion system CeRh$In_{5−x}$$Sn_{x}$ in its (x,T) phase diagram up to the vicinity of the critical concentration $x_{c}$ ≈0.40, where long range magnetic order is suppressed. The propagation vector of the magnetic structure is found to be $k_{IC}$=(1/2,1/2,$k_{l}$) with kl increasing from $k_{l}$=0.298 to $k_{l}$=0.410 when xincreases from x=0 to x=0.26. Surprisingly, for x=0.30, the order has changed drastically and a commensurate antiferromagnetism with $k_{C}$=(1/2,1/2,0) is found. This concentration is located in the proximity of the quantum critical point where superconductivity is expected.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

S. Raymond, Jonathan Buhot, E. Ressouche, F. Bourdarot, G. Knebel, et al.. Switching of the magnetic order in CeRh$In_{5−x}$$Sn_{x}$ in the vicinity of its quantum critical point. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (1), ⟨10.1103/PhysRevB.90.014423⟩. ⟨hal-01937756⟩