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.
Strength of Correlation Effects in the Electronic Structure of Iron / J., Sánchez Barriga; J., Fink; BONI, VALENTINA; I., Di Marco; J., Braun; J., Minár; A., Varykhalov; O., Rader; V., Bellini; MANGHI, Franca; H., Ebert; M. I., Katsnelson; A. I., Lichtenstein; O., Eriksson; W., Eberhardt; H. A., Dürr. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 103(2009), pp. 267203-267207.
Strength of Correlation Effects in the Electronic Structure of Iron
BONI, VALENTINA;MANGHI, Franca;
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.
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