Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Magnetic Materials II

MA 13.4: Vortrag

Dienstag, 8. März 2016, 10:15–10:30, H31

Strongly correlated alloys and dynamical mean field theory — •Alexander Poteryaev — M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, Ekaterinburg 620137, Russia — Institute of Quantum Materials Science, Ekaterinburg 620075, Russia

For the physical description of the transition metal alloys both strong interactions and disorder have to be accounted for, and hence it is highly desirable to have a method that can treat, on equal footing, disorder and partially filled strongly interacting d states of transition metals. Combination of two techniques, the coherent potential approximation for disorder and the dynamical mean-field theory for correlated electrons which share an effective medium interpretation of the system of interest, allows one to investigate different physical properties of real alloys. The magnetic properties of Fe-Ni alloy and structural phase transition in Fe-Mn alloy are investigated as a function of temperature and concentration. Comparison of the coherent potential approximation and dynamical mean-field theory calculations agrees well with experimental data.