Change search
ReferencesLink to record
Permanent link

Direct link
Probing two- and three-dimensional electrons in MgB2 with soft x-ray angle-resolved photoemission
Show others and affiliations
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 4, 045114- p.Article in journal (Refereed) Published
Abstract [en]

electronic band structure of MgB2 involves a unique combination of two-and three-dimensional (3D) electrons derived from the boron sigma and pi states, respectively. We have mapped out the sigma and pi bands over the complete Brillouin zone, including the full disconnected Fermi surface, using high-resolution soft x-ray angle-resolved photoelectron spectroscopy. The measured band structure, which is closely related to that of graphene, is in overall good agreement with the density functional theory-general gradient approximation (DFT-GGA), though differences in Fermi surface volume are seen. Surprisingly, the measured bands are wider than calculated, by similar to 8% for the s and similar to 10-15% for the p bands. This solves the long-standing challenge of establishing the full 3D electronic structure of the model compound MgB2, and it demonstrates the tendency of DFT-GGA to overestimate the band narrowing due to exchange correlations effects.

Place, publisher, year, edition, pages
2015. Vol. 91, no 4, 045114- p.
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-160388DOI: 10.1103/PhysRevB.91.045114ISI: 000348156100002ScopusID: 2-s2.0-84921038763OAI: diva2:790887
Swedish Research Council

QC 20150226

Available from: 2015-02-26 Created: 2015-02-19 Last updated: 2015-02-26Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Tjernberg, Oscar
By organisation
Material Physics, MF
In the same journal
Physical Review B. Condensed Matter and Materials Physics
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 31 hits
ReferencesLink to record
Permanent link

Direct link