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Departmental Colloquium


Imaging Charge, Spin, and Lattice in Manganites

Yeong-Ah Soh

NEC Research Institute
4 Independence Way
Pinceton, New Jersey

Time
 
Tue. January 14, 2003     10:30 AM     STIRLING 501

Abstract
 

Manganese oxides with perovskite structure display a wealth of electronic and magnetic phases, ranging from charge-ordered insulator, ferromagnetic metal, to paramagnetic insulator. In this talk, I will show how we imaged the various phases using local probes, such as magnetic force microscopy, x-ray microdiffraction, and scanning tunneling microscopy. In particular, I will show how the presence of the strong electron-lattice coupling plays a role in the magnetism of colossal magnetoresistive films on a mesoscopic length scale, resulting in a variation of the Curie temperature of the amount of 20 K over a micron length scale. In addition, I will show charge ordering on an atomic length scale.

Dr. Yeong-Ah Soh is a candidate for the tenure-stream position for Condensed Matter Physics within the Department of Physics.

Refreshments will be available in the lounge after the talk.

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