The surface stability of CoS₂(100)

Authors

Ning Wu, University of Nebraska-Lincoln
Renat F. Sabirianov, University of Nebraska at OmahaFollow
Chun-gang Duan, University of Nebraska-LincolnFollow
Wai-Ning Mei, University of Nebraska at OmahaFollow
David Wisbey, University of Nebraska-Lincoln
Yaroslav B. Losovyj, University of Nebraska-LincolnFollow
M. Manno, University of Minnesota
C. Leighton, University of Minnesota
En Cai, Florida International University
Jiandi Zhang, Florida International UniversityFollow
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

2008

Comments

Published in J. Phys.: Condens. Matter 20 (2008) 215231 (6pp)

Abstract

The stability of various possible terminations of the CoS₂ (1 × 1) surface have been explored and theoretical expectations are found to agree with experiment. With extensive annealing, there is a phase separation at the (100) surface of CoS₂. Sulfur segregation to the surface leads to a significant change in the largely sulfur bands due to changes in the hybridized bands, with cobalt. Resonant photoemission spectra indicate clearly that the hybridized cobalt and sulfur bands, characteristic of the CoS₂ bulk, lie at higher binding energies than those of segregated sulfur layers. This is discussed in terms of the stability of various surface structures.