Complex antiferromagnetic structure in the intermediate-valence intermetallic Ce₂RuZn₄

Neutron powder diffraction experiments were performed on the intermediate-valence Ce₂RuZn₄ intermetallic compound and combined with magnetic bulk measurements including high magnetic field experiments up to 58 T. Previous theoretical studies suggest that only one (here Ce1) out of two inequivalent Ce sites ismagnetically active. Ce₂RuZn₄ orders antiferromagnetically at T_N = 2.3 K. The magnetic structure is characterized by an incommensurate propagation vector q_m = (0.384, 0.384, 1/2). Assuming that the Ce2 site does not carry any substantial moment, Ce1 magnetic moments are confined to the (110)-type planes and transversely modulated with an amplitude of 1.77(3) μ_B.