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MA: Magnetismus

MA 22: Magnetische dünne Schichten III

MA 22.4: Vortrag

Donnerstag, 27. März 2003, 11:00–11:15, HSZ/04

Phase diagram of the electron doped manganite La_1−xCe_xMnO₃ — •Steffen Wirth¹, Pratap Raychaudhuri², Ajay Thakur², Peter Mann³, and Chiranjib Mitra⁴ — ¹MPI for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — ²Dept. of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India — ³School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK — ⁴Dept. of Materials Science, University of Cambridge, Pembroke St, Cambridge CB2 3QZ, UK

We report on the electronic, transport and magnetic properties of the Ce-doped manganite, La_1−xCe_xMnO₃. In many respects, this material is remarkably similar to the heavily investigated hole doped manganite La_1−xCa_xMnO₃ (T_C ∼ 250 K for x = 0.3). The main difference, however, 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 this electron doping by X-ray absorption spectroscopy (XAS) and extensive Hall measurements covering a broad temperature range below and above T_C. From the transport data, the magnetic phase diagram of La_1−xCe_xMnO₃ is established. The electron doping of the Ce-doped material along with otherwise similar properties as found for the Ca-doped counterpart makes these manganites highly interesting for basic research as well as for possible applications [1], e.g. in spintronics.

[1] C. Mitra et al., in print for PRL.