Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 45: Spin-dependent Transport Phenomena II

MA 45.3: Talk

Thursday, March 19, 2015, 15:30–15:45, H 0112

Compton profiles of random Fe_0.5Ni_0.5 alloy, evidence for the interplay of disorder and correlation in momentum space — •Liviu Chioncel^1,2, Diana Benea^3,4, Hubert Ebert⁴, and Jan Minar^4,5 — ¹Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D - 86135 Augsburg, Germany — ²Augsburg Center for Innovative Technologies, University of Augsburg, D-86135 Augsburg, Germany — ³Faculty of Physics, Babes-Bolyai University, Kogalniceanustr 1, Ro-400084 Cluj-Napoca, Romania — ⁴Chemistry Department, University Munich, Butenandstr. 5-13, D-81377 München, Germany — ⁵New Technologies - Research Center, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic

We study the magnetic Compton profile of the disordered Fe₅₀Ni₅₀ alloy and discuss the interplay between structural disorder and electronic correlations. The disorder distribution is described within the Coherent Potential Approximation while local electronic correlations are captured with the Dynamical Mean Field Theory. The disorder induced changes in the experimental magnetic Compton profiles are well described by the theoretical calculations only when both components Fe and Ni are subject to considerable electronic correlations.