The electronic band structure of CoS2

doi:10.1088/0953-8984/19/15/156224

The electronic band structure of CoS₂

Ning Wu et al 2007 J. Phys.: Condens. Matter 19 156224 (10pp) doi: 10.1088/0953-8984/19/15/156224

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Ning Wu¹, Ya B Losovyj^1,2, David Wisbey¹, K Belashchenko¹, M Manno³, L Wang³, C Leighton³ and P A Dowben^1,4
¹ Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588-0111, USA
² Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70806, USA
³ Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA
⁴ Address for correspondence: Department of Physics and Astronomy, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
E-mail: pdowben@unlinfo.unl.edu

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 analysed 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.

Print publication: Issue 15 (16 April 2007)
Received 9 January 2007, in final form 24 February 2007
Published 26 March 2007

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The electronic band structure of CoS₂

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