Neutron scattering studies of La2CuO/sub 4-δ/

In order to investigate in detail how the magnetic and structural properties of La2CuO/sub 4-δ/ are related to the oxygen deficiency δ, a series of single crystals was grown and heat-treated in vacuum at different temperatures. It was found that the magnetic structure is independent of oxygen deficiency δ, while the transition temperature T/sub N/ and the magnetic moment μ per Cu atom strongly depend on δ. It was also found that the orthorhombic distortion, measured as the relative difference of the lattice constants a and c, c/a - 1 is not very sensitive to the oxygen concentration at low temperature. (a = c in the high temperature tetragonal phase.)