Incommensurate magnetic order in the pressure-induced superconductor CeRhSi3

Neutron diffraction experiments were performed to investigate a nature of the antiferromagnetic ordered phase below T N = 1.6 K of the pressure-induced superconductor CeRhSi 3 . We observed incommensurate magnetic reflections characterized by the wave vector Q = ( ± δ , 0 , 0.5 ) ( δ ∼ 0.215 ) . The antiferromagnetic ordered state can be interpreted as a spin-density wave formation by taking account of the results on de Haas–van Alphen (dHvA) signals in CeRhSi 3 where the 4f-electrons of CeRhSi 3 are itinerant.