Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO_1-<i>y</i> (Ln = La, Nd)

The crystal structure of LnFeAsO$_{1-y}$ (Ln = La, Nd) has been studied by the powder neutron diffraction technique. The superconducting phase diagram of NdFeAsO$_{1-y}$ is established as a function of oxygen content which is determined by Rietveld refinement. The small As-Fe bond length suggests th... View More