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We report a combined experimental and theoretical investigation of thelayered antimonide PrMnSbO which is isostructural to the parent phase of theiron pnictide superconductors. We find linear resistivity near room temperatureand Fermi liquid-like T^{2} behaviour below 150 K. Neutron powder diffractionshows that unfrustrated C-type Mn magnetic order develops below \sim 230 K,followed by a spin-flop coupled to induced Pr order. At T \sim 35 K, we find atetragonal to orthorhombic (T-O) transition. First principles calculations showthat the large magnetic moments observed in this metallic compound are of localorigin. Our results are thus inconsistent with either the itinerant orfrustrated models proposed for symmetry breaking in the iron pnictides. We showthat PrMnSbO is instead a rare example of a metal where structural distortionsare driven by f-electron degrees of freedom.

Local moments and symmetry breaking in metallic PrMnSbO