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About the strength of correlation effects in the electronic structure of iron

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arxiv 0910.4360 v1 pith:TSE3NRBW submitted 2009-10-22 cond-mat.str-el cond-mat.other

About the strength of correlation effects in the electronic structure of iron

J. Sanchez-Barriga , J. Fink , V. Boni , I. Di Marco , J. Braun , J. Minar , A. Varykhalov , O. Rader
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V. Bellini F. Manghi H. Ebert M.I. Katsnelson A. I. Lichtenstein O. Eriksson W. Eberhardt H. A. Duerr
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classification cond-mat.str-el cond-mat.other
keywords calculationscorrelationeffectselectronicmany-bodyphotoemissionscatteringstrength
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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 non-local fluctuations.

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