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Tiny cause with huge impact: polar instability through strong magneto-electric-elastic coupling in bulk EuTiO3

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Reuvekamp Patrick, Caslin Kevin, Guguchia Zurab, Keller Hugo, Kremer Reinhard K., Simon Arndt, Koehler Juergen, Bussmann-Holder Annette,
Project Interplay between the superconductivity and magnetism in cuprate and Fe-based superconductors
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Original article (peer-reviewed)

Journal JOURNAL OF PHYSICS-CONDENSED MATTER
Volume (Issue) 27(26)
Page(s) 262201
Title of proceedings JOURNAL OF PHYSICS-CONDENSED MATTER
DOI 10.1088/0953-8984/27/26/262201

Abstract

EuTiO3 exhibits strong magneto-electric coupling at the onset of antiferromagnetic order below T-N = 5.7 K. The dielectric permittivity drops at TN by 7\% and recovers to normal values with increasing magnetic field. This effect is shown to stem from tiny lattice effects as seen in magnetostriction data which directly affect the soft optic mode and its polarizability coordinate. By combining experimental results with theory we show that marginal changes in the lattice parameter of the order of 0.01\% have a more than 1000\% effect on the transverse optic soft mode of ETO and thus easily induce a ferroelectric instability.
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