Magnetic structure of Nd2Mo2O7

Neutron diffraction studies have been carried out on a single crystal of the metallic pyrochlore ferromagnet Nd2Mo2O7. The magnetic structures proposed at 4 K is non-collinear for both the Mo- and Nd-moments, where the net moments of the two systems align antiparallel. In the temperature region between the Curie point (∼93 K) and ∼30 K, the moments primarily at Mo sites orders with the ferromagnetic magnetization, where the structure seems to be non-collinear, too. The ordering of the Nd moments gradually develops and becomes significant below ∼20 K with decreasing temperature. Discussion on the relationship between the magnetic structure and the anomalous transport properties is presented. (author)