Magnetic structure of lanthanum copper oxide La2Cu2O5

A noncollinear antiferromagnetic structure with the propagation vector k = [0 1/2 0] and the transition temperature of approximate to 130 K was found in the monoclinic compound La2Cu2O5 by single-crystal neutron diffraction. The crystal structure parameters and the values and directions of the magne tic moments have been obtained by least-squares refinement. Similar to rare -earth cuprates R2CuO4 the compound La2Cu2O5 shows a low-dimensional magnet ic behaviour with critical index beta = 0.228(8).