An Incommensurate Magnetic Diffuse Scattering in Superconducting La1.92Sr0.08CuO4-delta

By neutron quasielastic scattering experiments, we observed a two-dimensional antiferromagnetic diffuse scattering in a superconducting La 1.92 Sr 0.08 CuO 4-δ sample at room temperature as well as in a superconducting phase. The line shape of the magnetic diffuse scattering at 295 K is a conventional Lorentzian, whereas it changes to a non-Lorentzian shape at low temperatures, presumably being a double peak structure with the peaks shifted by 0.05 a * from the antiferromagnetic zone center.