Ferroelectric phase transitions in multiferroic Ge1xMnxTe driven by local lattice distortions

Dominik Kriegner, Jürgen Furthmüller, Raimund Kirchschlager, Jan Endres, Lukas Horak, Petr Cejpek, Helena Reichlova, Xavier Marti, Daniel Primetzhofer, Andreas Ney, Günther Bauer, Friedhelm Bechstedt, Vaclav Holy, and Gunther Springholz
Phys. Rev. B 94, 054112 – Published 19 August 2016
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Abstract

The evolution of local ferroelectric lattice distortions in multiferroic Ge1xMnxTe 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.

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  • Received 13 October 2015
  • Revised 27 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.054112

©2016 American Physical Society

Authors & Affiliations

Dominik Kriegner1,*, Jürgen Furthmüller2, Raimund Kirchschlager3, Jan Endres1, Lukas Horak1, Petr Cejpek1, Helena Reichlova4, Xavier Marti4, Daniel Primetzhofer5, Andreas Ney3, Günther Bauer3, Friedhelm Bechstedt2, Vaclav Holy1, and Gunther Springholz3

  • 1Department of Condensed Matter Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Praha 2, Czech Republic
  • 2Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
  • 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
  • 4Institute of Physics ASCR, v.v.i., Cukrovarnická 10, 162 53 Praha 6, Czech Republic
  • 5Ion Physics Department, The Ångström Laboratory, Uppsala University, P.O. Box 534, SE-75121, Sweden

  • *kriegner@mag.mff.cuni.cz

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Issue

Vol. 94, Iss. 5 — 1 August 2016

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