Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
066104
Volume
102
Issue
6
Abstract
We study the surface structure of La5/8Ca3/8MnO3(001) using in-situ scanning tunnelingmicroscopy (STM). Atomically resolved STM images reveal that a
( 2 " 2)R45oreconstructed surface and a (1�1) surface can be converted back and forth through adsorptionand desorption of oxygen at the surface. Electrical properties of the surfaces are investigated byscanning tunneling spectroscopy (STS). I-V curves clearly show that the presence of an oxygen
overlayer renders the surface insulating while the (1�1) surface without the oxygen overlayer is metallic.
