Tuesday, January 22, 2008, 10:00 am — Bldg. 735 - Conf. Rm. B
Understanding the structure-property relationship of dielectric materials and strongly correlated electron systems, including manganites and superconductors, is major challenge in condensed-matter physics, material sciences and nano-sciences. We studied two kinds of dielectric materials, Ba0.7Sr0.3TiO3 (BST) and PbZr0.8Ti0.2O3 (PZT) grown on SrRuO3 (SRO)-buffered SrTiO3 (STO) substrates; we observed a dead layer at the BST/SRO interface, and strange displacements and tetragonality close to the PZT/SRO interface. Both have vital effects on the material’s physical properties. For La0.325 Pr0.3Ca0.375MnO3 (LPCMO) manganites, we employed Lorentz transmission electron microscopy (LTEM) to observe the interesting behavior of the magnetic domain’s wall structures at the nanoscale and to highlight the relationship between special magnetic structures and demagnetization fields. We also describe how a charge- ordered, ferromagnetic state is stabilized, a feature that plays an important role in driving the phase- transition from an insulator to a metal. Finally, we detail our results in exploring La1-xSrXCuO4 superconductor films on LaSrAlO4 substrate by (S)TEM and EELS.
Hosted by: Yimei Zhu
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