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Growth, Characterization and Magnetic Properties of Polycrystalline Fibers of Electron Doped Manganites

This paper is available in a repository.
This paper is available in a repository.

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Abstract

In this Chapter we review some of our latest results regarding the growth, characterization and magnetic properties of bulk samples (composite fibers) of the optimally doped La 1-x Ce x MnO 3 manganites by using the Laser Heated Pedestal Growth technique. It has been widely recognized that, in comparison with the hole doped manganite (like, e.g., La 1-x Ca x MnO 3), its electron doped counterpart La 1-x Ce x MnO 3 is a metastable phase. That is why, before optimizing the growth conditions, we were able to grow polycrystalline multiphase fibers. Their composition and granularity were verified through Scanning Electron Microcopy with Energy Dispersive X-ray analysis. The magnetic behavior of the fibers was probed by AC susceptibility and magnetization measurements as a function of temperature. Several ferromagnetic transitions were identified. In addition to a weak transition at T C0 =45K (due to MnO 2 impurities), three more transitions with Curie temperatures T C1 =126K, T C2 =180K, and T C,max =300K were observed and linked to fiber regions with cerium concentration of x=0.063, x=0.13, and x=0.3,respectively.