Improving room temperature magnetoresistance in derivatives of ferrimagnetic CaCu3Mn4O12 perovskite

Abstract Two series of derivatives of the complex CaCu3Mn4O12 perovskite have been prepared under moderate pressure conditions (20 kbar), and characterized by neutron powder diffraction, magnetic and magnetotransport measurements. In a susbtituted series with formula LnCu3Mn4O12 (Ln=rare earths) we observe a significant increment of TC and a level of low field magnetoresistance at RT that compete with the best values described for the state-of-the art perovskite oxide systems.