Strength of Correlation Effects in the Electronic Structure of Iron

J. Sánchez-Barriga, J. Fink, V. Boni, I. Di Marco, J. Braun, J. Minár, A. Varykhalov, O. Rader, V. Bellini, F. Manghi, H. Ebert, M. I. Katsnelson, A. I. Lichtenstein, O. Eriksson, W. Eberhardt, and H. A. Dürr

Phys. Rev. Lett. 103, 267203 – Published 23 December 2009

Abstract

The strength of electronic correlation effects in the spin-dependent electronic structure of ferromagnetic bcc Fe(110) has been investigated by means of spin and angle-resolved photoemission spectroscopy. The experimental results are compared to theoretical calculations within the three-body scattering approximation and within the dynamical mean-field theory, together with one-step model calculations of the photoemission process. This comparison indicates that the present state of the art many-body calculations, although improving the description of correlation effects in Fe, give too small mass renormalizations and scattering rates thus demanding more refined many-body theories including nonlocal fluctuations.

Received 16 October 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.267203

Authors & Affiliations

J. Sánchez-Barriga¹, J. Fink^1,2, V. Boni³, I. Di Marco^4,5, J. Braun⁶, J. Minár⁶, A. Varykhalov¹, O. Rader¹, V. Bellini³, F. Manghi³, H. Ebert⁶, M. I. Katsnelson⁵, A. I. Lichtenstein⁷, O. Eriksson⁴, W. Eberhardt¹, and H. A. Dürr¹

¹Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
²Leibniz-Institute for Solid State and Materials Research Dresden, Post Office Box 270116, D-01171 Dresden, Germany
³Dipartimento di Fisica, Università di Modena, Via Campi 213/a, I-41100 Modena, Italy
⁴Department of Physics and Material Science, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
⁵Institute of Molecules and Materials, Radboud University of Nijmegen, Heijendaalsweg 135, 6525 AJ Nijmegen, The Netherlands
⁶Dep. Chemie und Biochemie, Physikalische Chemie, Universität München, Butenandtstr. 5-13, D-81377 München, Germany
⁷Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany

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Vol. 103, Iss. 26 — 31 December 2009

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