Abstract
Magnetic susceptibility and neutron diffraction investigations on polycrystalline samples of the green phase Y2BaCuO5 show that copper moments order antiferromagnetically at about 28 K. Two magnetic reflections have been observed at T = 2 K which can be indexed as 10½ and ½1½ reflections implying the existence of two independent wave vectors k1 = (00½) and k2 = (½0½). The copper magnetic moments are 0.87(2)μB and are oriented at an angle of 39° to the c-axis in the (a, c)-plane.
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