Magnetic structure of NiS2-xSex

NiS2-2xSex is revisited to determine the magnetic structure using neutron diffraction and magnetic representational analysis. Upon cooling, the insulating parent compound, NiS2, becomes antiferromagnetic with two successive magnetic transitions. The first transition (M1) occurs at T-N similar to 39 K with Gamma(1)Psi(1) symmetry and a magnetic propagation vector of k = (000). The second transition (M2) occurs at T-N similar to 30 K with k = (0.5,0.5,0.5) and a Gamma(1)Psi(2) symmetry with face-centered translations, giving rise to four possible magnetic domains. With doping, the system become smetallic. The transition to the M2 state is suppressed prior to x = 0.4 while the M1 state persists. The M1 magnetic structure gradually vanishes by x similar to 0.8 at a lower concentration than previously reported. The details of the magnetic structures are provided.