Neutron diffraction studies on a ferromagnetic layered manganite La2-2xSr1+2xMn2O7 (x=0.3) prepared by a ceramic method

Low-temperature neutron diffraction data on a ceramic sample of layered perovskite type La2-2xSr1+2xMn2O7, x=0.3, are reported. The neutron diffraction data show that this compound undergoes a ferromagnetic transition at 100 K (Tc), but there is no antiferromagnetic signal as reported on a floating zone melt grown sample of the same nominal composition. The unit cell constants and cell volume for this nominal x=0.3 sample are slightly larger …