We investigated powder samples of the tetrametaphosphates M2P4012 (M = Mn, Co, Ni, Cu) by magnetic measurements and neutron diffraction down to 1.7 K. Except for the Cu compound we found N&l temperatures and overall antiferromagnetic LRO. The Mn isomorph shows ID-Heisenberg behaviour. Ni2P4012 undergbes a spin-flop, Co2P4012 a two-step metamagnetic transition.
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