Phase diagram and Hall effect of the electron doped manganite La_1-xCe_xMnO₃

Abstract

We report on the electronic, transport, and magnetic properties of the Ce-doped manganite, La_1-xCe_xMnO₃. This material is remarkably similar to the heavily investigated hole doped manganite La_1-xCa_xMnO₃; e.g., both materials show Curie temperatures of T_c∼250 K for x=0.3. The main difference which makes the Ce-doped material highly interesting for basic research as well as for possible applications (e.g., in spintronics) is the fact that Ce doping drives the manganese in a mixture of Mn²⁺ and Mn³⁺ induced by electron doping. We present conclusive evidence for electron doping by x-ray absorption spectroscopy and Hall measurements on single phase epitaxial thin films. From transport measurements on a series of La_1-xCe_xMnO₃, the magnetic phase diagram of La_1-xCe_xMnO₃ is established.