September 2010

Journal

Tunable Metallicity at La5/8Ca3/8MnO3(001)Surface by Oxygen Overlayer

By:
Fuchigami, Kenji ; Gai, Zheng ; Ward, Thomas Z; Yin, Lifeng ; Snijders, Paul C; Plummer, Earl W; Shen, Jian
Journal Name:
Physical Review Letters
Page Number:
66104
Volume:
102
Issue Number:
6
Publication Date:
September 23, 2010
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.102.066104

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.


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