Magnetic phase diagram of Ce0.70Pr0.30B6

Abstract Low-temperature, high-field ( H [ 1 1 ¯ 0 ] ⩽ 7.5 T ) , neutron diffraction experiments on single-crystal Ce0.70Pr0.30 B 6 11 are reported. Two successive incommensurate phases are found to exist in zero field. The appearance, for H ⩾ 4.6 T at T = 2 K , of an antiferromagnetic structure with k AF = ( 1 2 , 1 2 , 1 2 ) , most likely due to an underlying antiferroquadrupolar order, is discussed in connection with recent X-ray diffraction experiments.