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The complex perovskite ThCu 3 Mn 4 O 12  has been prepared at moderate pressures of 2 GPa. With respect to the parent compound CaCu 3 Mn 4 O 12 , the replacement of Ca 2+  by Th 4+  involves a double electronic injection that leads to a substantial increment of TC, up to 370 K. The crystal structure was refined in the space group Im3̄ from NPD data collected with λ = 1.33 Å at r. t. An additional NPD pattern recorded at 1.8 K with λ = 2.42 Å allowed to refine the magnetic structure, which displays a ferrimagnetic coupling between Mn 3+ /Mn 4+  and Cu 2+  spins, aligned along the c direction. The refined magnetic moments at the Mn and Cu substructures of 2.5 and −0.5 μ B , respectively, account for the observed saturation magnetisation at 2 K, of 7 μ B /f. u. A semiconducting behaviour is observed between 10 and 350 K which can be correlated with the appearance of a gap in the conduction band for the ~50% Mn 3+ /50% Mn 4+  mixed valence observed in the B substructure of this perovskite.

Magnetism,Magnetotransport and Magnetic Structure of ThCu 3 Mn 4 O 12 , Prepared at Moderate Pressures