The macroscopic magnetizations of a RuSr2(Eu0.7Ce0.3)2Cu2O10+δ sample were investigated. A ferromagnetlike transition occurs around TM in the low-field magnetization. Highly nonlinear M(H), non-Curie-Weiss susceptibility, and slow spin dynamics, however, were observed up to T1 ≈ (2–3)TM. In addition, an antiferromagnetlike differential-susceptibility maximum of Ru appears around a separate temperature TAM between T1 and TM. The data are therefore consistent with a phase-separation model: superparamagnetic clusters (or short-range spin orders) are first precipitated from the paramagnetic matrix below T1, followed by an antiferromagnetic transition of the matrix at TAM and an apparent ferromagnetic (FM) transition around TM, where the long-range spin order is established in the FM species embedded in the matrix.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2003 May 8|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics