Two-step transition in a magnetoelectric ferrimagnet Cu2OSeO3

Živković, Ivica and Pajić, Damir and Ivek, T. and Berger, Helmut (2012) Two-step transition in a magnetoelectric ferrimagnet Cu2OSeO3. Physical Review B, 85 (22). pp. 224402-1. ISSN 1098-0121

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We report a detailed single-crystal investigation of a magnetoelectric ferrimagnet Cu2OSeO3 using dc magnetization and ac susceptibility along the three principal directions [100], [110], and [111]. We have observed that in small magnetic fields two magnetic transitions occur, one at Tc=57 K and the second one at TN=58 K. At Tc the nonlinear susceptibility reveals the emergence of the ferromagnetic component and below Tc the magnetization measurements show the splitting between field-cooled and zero-field-cooled regimes. Above 1000 Oe the magnetization saturates and the system is in a single domain state. The temperature dependence of the saturation below Tc can be well described by μ(T)=μ(0)[1−(T/Tc)2]β, with μ(0)=0.56μB/Cu, corresponding to the 3-up-1-down configuration. The dielectric constant measured on a thin single crystal shows a systematic deviation below the transition, indicating an intrinsic magnetoelectric effect.

Item Type: Article
Keywords: ferrimagnet, magnetoelectric, crystal Cu2OSeO3, magnetic transitions, dielectric
Date: June 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 035-0352843-2845, 119-1191458-1017, 035-0000000-2836
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 May 2014 12:51
Last Modified: 23 Feb 2016 16:07

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