Two-step transition in a magnetoelectric ferrimagnet Cu2OSeO3

Scientific paper - Original scientific paper

• Author: Ivica Živković
• Author: Damir Pajić
• Author: T. Ivek
• Author: Helmut Berger
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): ferrimagnet; magnetoelectric; crystal Cu2OSeO3; magnetic transitions; dielectric
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical review B: Condensed matter and materials physics
• Numbering: vol. 85, no. 22, 224402
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.85.224402
• URN:NBN: urn:nbn:hr:217:980454
• Publication: 2012
• Project: Number: 035-0352843-2845; Title (croatian): Kvantni magneti: Osnovna stanja u kompeticiji; Leader: Mladen Prester; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 119-1191458-1017; Title (croatian): Nanomagneti; Leader: Krešo Zadro; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 035-0000000-2836; Title (croatian): Jako korelirani anorganski, organski i biomaterijali; Leader: Silvia Tomić; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: http://link.aps.org/doi/10.1103/PhysRevB.85.224402
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2012) by the American Physical Society. Received 24 January 2012; revised manuscript received 6 April 2012; published 7 June 2012.
• Created on: 2019-11-16 18:00:59