XPS and resistivity studies on Y-Ca-Mn-Al perovskites

Abstract

The Y0.67Ca0.33Mn1-xAlxO3 perovskites with x <= 0.2 were prepared by standard solid state reaction. The samples crystallize in an orthorhombic type structure having Pnma space group. The magnetic measurements show that the Mn4+ content increases as the aluminum substituted gradually manganese. The XPS study shows a decrease of the Mn3s splitting as the Al content increases and in addition the Mn3s and O1s core levels are shifted to higher binding energies. Magnetoresistivity measurements were also performed. These were correlated with data obtained from XPS and magnetic studies.