Naslov
Two-step transition in a magnetoelectric ferrimagnet Cu2OSeO3

Autori
Živković, Ivica ; Pajić, Damir ; Ivek, Tomislav ; Berger, Helmut

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 85 (2012), 22; 224402-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ferrimagnet; magnetoelectric; crystal Cu2OSeO3; magnetic transitions; dielectric

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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