Switching of Magnetic Ordering in CeRhIn₅under Hydrostatic Pressure

Abstract

Magnetic neutron diffraction measurements were carried out on the heavy-fermion antiferromagnet CeRhIn 5 under hydrostatic pressure. The incommensurate (IC) magnetic ordering is known to be characterized by the propagation vector τ = (0.5, 0.5, ±δ). We have found that when the temperature is lowered at P ∼1.48 GPa, the magnetic Bragg peak with δ= 0.326 rapidly disappears and instead a new Bragg peak with δ= 0.391 suddenly emerges at a temperature close to the superconducting transition temperature. This suggests the possibility that the antiferromagnetic order is affected by the superconductivity.