Ferroelectric phase transitions in multiferroic Ge1-xMnxTe driven by local lattice distortions

0471266 - FZÚ 2017 RIV US eng J - Journal Article
Kriegner, D. - Furthmüller, J. - Kirchschlager, R. - Endres, J. - Horák, L. - Cejpek, P. - Reichlová, Helena - Martí, Xavier - Primetzhofer, D. - Ney, A. - Bauer, G. - Bechstedt, F. - Holy, V. - Springholz, G.
Ferroelectric phase transitions in multiferroic Ge1-xMnxTe driven by local lattice distortions.
Physical Review B. Roč. 94, č. 5 (2016), 1-8, č. článku 054112. ISSN 2469-9950. E-ISSN 2469-9969
Institutional support: RVO:68378271
Keywords : semiconductor Ge_1-xMn_xTe * GeTe * GeMnTe * alloys * heat * Mn
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.836, year: 2016

The evolution of local ferroelectric lattice distortions in multiferroic Ge1-xMnxTe 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.
Permanent Link: http://hdl.handle.net/11104/0268662