Europhys. Lett.
Volume 61, Number 5, March 2003
Page(s) 667 - 673
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 February 2003
DOI: 10.1209/epl/i2003-00128-3
Europhys. Lett., 61 (5) , pp. 667-673 (2003)

Atomic correlations in itinerant ferromagnets: Quasi-particle bands of nickel

J. Bünemann1, F. Gebhard2, T. Ohm3, R. Umstätter3, S. Weiser3, W. Weber3, R. Claessen4, D. Ehm5, A. Harasawa6, A. Kakizaki6, A. Kimura7, G. Nicolay5, S. Shin6 and V. N. Strocov4

1  Oxford University, Physics and Theoretical Chemistry Laboratory Oxford OX1 3QZ, UK
2  Fachbereich Physik, Philipps-Universität Marburg - D-35032 Marburg, Germany
3  Institut für Physik, Universität Dortmund - D-44221 Dortmund, Germany
4  Experimentalphysik II, Universität Augsburg - D-86135 Augsburg, Germany
5  Experimentalphysik, Universität des Saarlandes - D-66041 Saarbrücken, Germany
6  Institute for Solid-State Physics, University of Tokyo Kashiwa, Chiba 277-8581, Japan
7  Department of Physical Sciences, Hiroshima University Higashi, Hiroshima 739-8526, Japan

(Received 5 July 2002; accepted in final form 12 December 2002)

The Gutzwiller theory is demonstrated to resolve most of the long-standing discrepancies between experiment and theory on the quasi-particle bands of ferromagnetic nickel. This is confirmed by new angle-resolved photoelectron spectroscopy data along various high-symmetry lines of the bulk Brillouin zone obtained under full control of the three-dimensional momentum. Our findings support the view of itinerant ferromagnetism as a consequence of atomic correlations.

71.20.Be - Transition metals and alloys.
71.10.Fd - Lattice fermion models (Hubbard model, etc.).
71.10.Ay - Fermi-liquid theory and other phenomenological models.

© EDP Sciences 2003