Evidence of ferromagnetic short-range correlations in cubic La_1−xSr_xMnO_3−δ(x = 0.80, 0.85) above antiferromagnetic ordering

Abstract

We report the existence of ferromagnetic correlations (FMC)

Layered Antiferromagnetic Ordering in the Most Active Perovskite Catalysts for the Oxygen Evolution Reaction

“…It is possible that for some of the AFM perovskite systems discussed, room temperature is above their Neel temperatures ( T N ), meaning that the extended ground state magnetic ordering is disrupted, and they are macroscopically paramagnetic. Measurements on ferromagnetic crystals still find magnetic domains on the order of 1–2 nm in size above Curie temperature . AFM domains can be reasonably expected to have similar sizes above T N .…”

“…AFM domains can be reasonably expected to have similar sizes above T N . Within such domains, we expect that the effective magnetic momentum, μ eff , will persist longer than the time required for the spin‐sensitive electron transfer to occur . We consider that the property we have calculated, μ ave , is then closely linked to the efficacy of this spin current/accumulation.…”

Observation of high-temperature magnetic transition and existence of ferromagnetic short-range correlations above transition in double perovskite La2FeMnO6

“…This feature is usually considered as a manifestation of typical Griffiths-like phases (GP). [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] GP was originally proposed as randomly distributed lsing FM regions with nearest neighbor exchange interactions J and 0 with probabilities p and (1 À p) respectively. 52 The CW t in PM region yields an effective magnetic moment, m eff ¼ 2:828 ffiffiffiffiffiffi C w p (C w is the Curie constant) as 6.5 m B per F.U.…”

Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

“…al. [64,65] and Aga Shahee et al [66] supported the above hypothesis. Since conductivity in manganites above T MI is accounted by the hopping of small polarons, it appears as if both the proposed models hold.…”

“…Arrott's plots) [57,66]. If the linear interpolation of the high-field-magnetization region of M 2 vs H/M yields a positive slope, it represents the presence of spontaneous moment with long-range FM order while the negative slope represents short-range FM correlations in the system.…”