“The Oldest Metal-Insulator Transition in Condensed Matter: the Verwey Transition of Magnetite, from the Bulk to the Surface”

Miércoles 12 de febrero

Salón de actos, 12:00

“The Oldest Metal-Insulator Transition in Condensed Matter: the Verwey Transition of Magnetite, from the Bulk to the Surface”

 Magnetite is the oldest magnetic material know to humankind. It is a magnetic conductor with applications in fields as diverse as catalysis and spintronics. But its popularity within the condensed matter community lies partly in that it presents the oldest known metal-insulator transition, the Verwey transition, whose discovery is now nearly a century old. In this talk we will introduce the metal-insulator transitions, and focus on our results on the (100) surface of magnetite by low energy electron microscopy [1-4].

Nie, S. et al. Insight into Magnetite’s Redox Catalysis from Observing Surface Morphology during Oxidation. J. Amer. Chem. Soc. 135, 10091–10098 (2013).
de la Figuera, et al., Micromagnetism in (001) magnetite by spin-polarized low-energy electron microscopy. Ultramicroscopy 130, 77–81 (2013).
de la Figuera, J. et al. Real-space imaging of the Verwey transition at the (100) surface of magnetite. Phys. Rev. B 88, 161410 (2013).Bartelt, N.C., Order-disorder transition on the (100) surface of magnetite, Phys. Rev. B. 88 (2013) 235436