• Raichle, M.; Reehuis, M.; Andre, G.; Capogna, L.; Sofin, M.; Jansen, M.; Keimer, B.: Incommensurate spin-density modulation in a copper oxide chain compound with commensurate charge order. Physical Review Letters 101 (2008), p. 047202/1-4

10.1103/PhysRevLett.101.047202

Abstract:
Neutron diffraction has been used to determine the magnetic structure of Na(8)Cu(5)O(10), a stoichiometric compound containing chains based on edge-sharing CuO(4) plaquettes. The chains are doped with 2/5 hole per Cu site and exhibit long-range commensurate charge order with an onset well above room temperature. Below T(N) = 23 K, the neutron data indicate long-range collinear magnetic order with a spin-density modulation whose propagation vector is commensurate along, and incommensurate perpendicular to, the chains. Competing interchain exchange interactions are discussed as a possible origin of the incommensurate magnetic order.