The magnetic properties of the alkali metal manganese pnictides KMnP, RbMnP, CsMnP, RbMnAs, KMnSb, KMnBi, RbMnBi, and CsMnBi - Neutron diffraction and susceptibility measurements

In order to determine the spin structures and the magnetic moments of the m anganese atoms neutron diffraction experiments and susceptibility measureme nts were performed on the alkali metal manganese pnictides KMnP, RbMnP, CsM nP, RbMnAs, KMnSb, KMnBi, RbMnBi, and CsMnBi. All compounds order antiferro magnetically. For KMnBi and KMnSb the spin structures may be described in t he crystallographic unit cells and Shubnikov group P4'/n'm'm. For the other compounds the lattice constants c have to be doubled, and the Shubnikov gr oup is P4'/n'cc'. With these results it is possible to analyse the correlat ion between magnetic moments and crystallographic parameters for the comple te series of compounds AMnX with A corresponds to Na, K, Rb or Ca and X cor responds to P, As, Sb or Bi.