Condensed-Matter Physics & Materials Science Seminar

"Spatially resolved spin and charge transport in La0.7Ca0.3MnO3 thin films."

Presented by Cameron Hughes, California Institute of Technology

Wednesday, May 27, 2009, 1:30 pm — Bldg. 480 conference room

We use variable temperature scanning tunneling microscopy (STM) with
both spin polarized and nonpolarized STM tip to investigate charge and
spin transport in La0.7Ca0.3MnO3 (LCMO) thin films. At 77K, we observe
increased inhomogenity in film conductance, in addition to high energy
features in the density of states associated with bulk ferromagnetism
not present at room temperature and a low energy gap possibly associated
with a surface insulating state. Spin polarized tunneling also shows a
marked increase in conductance, consist with a parallel configuration
for tip and sample.

Hosted by: Ivan Bozovic

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