Research Papers in Physics and Astronomy

 

Date of this Version

3-26-2007

Comments

Published in Journal of Physics: Condensed Matter 19 (2007), 156224 (10 pp); doi:10.1088/0953- 8984/19/15/156224 Online at HREF="http://stacks.iop.org/JPhysCM/19/156224"http://stacks.iop.org/JPhysCM/19/156224 Copyright © 2007 IOP Publishing Ltd. Used by permission.

Abstract

Angle-resolved and energy-dependent photoemission was used to study the band structure of paramagnetic CoS2 from high-quality single-crystal samples. A strongly dispersing hybridized Co–S band is identified along the Γ–X line. Fermi level crossings are also analyzed along this line, and the results are interpreted using band structure calculations. The Fermi level crossings are very sensitive to the separation in the S–S dimer, and it is suggested that the half-metallic gap in CoS2 may be controlled by the bonding– antibonding splitting in this dimer, rather than by exchange splitting on the Co atoms.

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