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We performed elastic neutron scattering experiments on solid solutionCeRh1-xCoxIn5 with x=0.4 to clarify the nature of the antiferromagnetic (AF)phase in the vicinity of the quantum critical point. We observed theincommensurate AF order below T_Nh=3.5 K. The structure of the incommensurateAF order is basically unchanged from that for pure CeRhIn5. We further foundthe evolution of a new commensurate AF order with the modulation ofq_c=(1/2,1/2,1/2) below T_Nc=2.9 K. The volume-averaged moments for theincommensurate and commensurate AF phases are 0.38 mu_B/Ce and 0.21 mu_B/Ce,respectively, which are reduced from the incommensurate AF moment (0.75mu_B/Ce) for pure CeRhIn5. We suggest from these results that the commensuratemagnetic correlation may be tightly coupled with the superconductivity observedbelow T_c=1.4 K.Comment: 5 pages, 4 figures, to appear in J. Phys. Soc. Jp

New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh0.6Co0.4In5

New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh_0.6Co_0.4In₅