We employ density functional theory with Hubbard U correction or hybrid functionals to study the series of magnetic 3d metal trifluorides MF (M = Ti-Ni). Experimental lattice parameters are reproduced with an error margin of 0.5%-4.3%. Cooperative Jahn-Teller distortions are reproduced for MnF , but also found in TiF and CoF at smaller levels compared to MnF . Trends in electronic structure with respect to positions of the d bands are linked to the magnetic properties where M = Ti-Cr are weak magnetic Mott-Hubbard insulators, M = Fe-Ni are strong magnetic charge-transfer insulators and MnF falls in between. Our work contributes to the characterization of the relatively unknown NiF , since FeF and CoF have similar electronic and magnetic properties. However, NiF does not show a Jahn-Teller distortion as present in CoF . © 2019 Wiley Periodicals, Inc.
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