Séminaire du lundi 5 mars 2012 à 10h30

 Electron microscopy on characterization of Superconducting Materials

Qiang Xu (Delft University of Technology, Delft. The Netherlands)

IMPMC, Université P. et M. Curie, 4, Place Jussieu, 75005 Paris

Salle de Conférence (401), 4ème étage, Tour 23, Couloir 23-22

By means of high resolution transmission electron microscopy, quantitative nano-electron diffraction and quantum chemistry calculations, we demonstrate the possibility of ab initio structure determination of novel phases, such as complex transition metal borates (e.g. Mg10Ir19B16) and oxides (e.g. Eu2CaCu2O2). We show that the structure of these new phases can be determined with high precision, comparable to single crystal X-ray or neutron diffraction methods, even if light atoms are present, e.g. B and O. We also show that the temperature dependence of these new structures can be studied in combination with in situ electrical transport property measurements within the transmission electron microscope in a wide range of temperature 80-1000 K.  Finally, a theoretical discussion will be given as to the possibility of direct imaging valence electron distribution using high resolution electron microscopy.

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