The evolution of local ferroelectric lattice distortions in multiferroic Ge1-x Mn x Te is studied by x-ray diffraction, x-ray absorption spectroscopy and density functional theory. We show that the anion/cation displacements smoothly decrease with increasing Mn content, thereby reducing the ferroelectric transition from 700 to 100 K at x = 0.5, where the ferromagnetic Curie temperature reaches its maximum. First principles calculations explain this quenching by different local bond contributions of the Mn 3d shell compared to the Ge 4s shell in excellent quantitative agreement with the experiments.

Department of Condensed Matter Physics Charles University Prague Ke Karlovu 5 121 16 Praha 2 Czech Republic

Institut für Festkörpertheorie und optik Friedrich Schiller Universität Max Wien Platz 1 07743 Jena Germany

Institute of Physics ASCR v v i Cukrovarnická 10 162 53 Praha 6 Czech Republic

Institute of Semiconductor and Solid State Physics Johannes Kepler University Linz Altenbergerstr 69 4040 Linz Austria

Ion Physics Department The Ångström Laboratory Uppsala University P O Box 534 SE 75121 Sweden

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