Wednesday, March 5, 2008, 1:30 pm — Bldg. 480 Conference Room
Interfaces between materials has often been an exciting area uncovering novel physics as noted by the discovery of behaviors such as the quantum hall effect. Key to this development was the ability to create high-quality atomically abrupt interfaces between different materials that allowed one to confine electrons in a two-dimensional environment near the interface. Recent advances in the growth of oxides now allow for the formation of sharp boundaries between even the intricate unit cells of complex oxides. These systems contain a variety of competing strong interactions which create a subtle balance to define the lowest energy state (e.g. metal, insulator, superconductor,...). Due to the broken symmetry and altered environments at the interface, unexpected states can emerge. Here I will review some our recent work on the electronic and magnetic properties of the superconductor (YBa2Cu3O7)/ferromagnet (LaCaMnO3) interface[1-3] as well as highlight some new areas of interest.
Work at Argonne is supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
[1] J. Chakhalian, J.W. Freeland, et. al. Nature Physics 2, 244 (2006).
[2] J.W. Freeland, et. al. Appl. Phys. Lett. 90, 242502 (2007).
[3] J. Chakhalian, J.W. Freeland, et. al. Science 318, 1114 (2007).
Hosted by: Ivan Bozovic
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