Regensburg 2016 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 11: Poster
DF 11.13: Poster
Wednesday, March 9, 2016, 18:00–20:00, Poster E
Magnetoelectric phase diagrams of GdMn2O5 — •Thomas Kain1, Hamad S. Bukhari1,2, Markus Schiebl1, Alexey Shuvaev1, Anna Pimenov1, Graeme Eoin Johnstone1, Wlad Dziom1, X. Wang3, and Andrei Pimenov1 — 1Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria — 2Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan — 3University of Science and Technology, Beijing, China
We have measured the temperature dependent dielectric constant ε of GdMn2O5 under applied magnetic field H to map out complete magnetoelectric phase diagrams. The obtained ε(H,T) phase diagrams show that except for the antiferromagnetic ordering transition at TN1 ∼ 40 K, all other transitions are strongly field dependent relative to the crystallographic axes. The phase diagram for H ∥ a shows a one-to-one correspondence with the tunable polarization induced by 90∘ rotation of Gd magnetic moment. Our results support the model of two ferroelectric sublattices Mn-Mn and Gd-Mn with strong R-Mn (4f-3d) interaction for the polarization in RMn2O5. Contrary to other members of the RMn2O5 family, the ferroelectric transitions (TN2 ∼ 31 K and TC ∼ 29 K) are sensitive to the applied field.