Suppression of charge order, disappearance of antiferromagnetism, and emergence of ferromagnetism inNd0.5Ca0.5MnO3nanoparticles

Large magnetoresistance induced by surface ferromagnetism in A-type antiferromagnetic La0.4Sr0.6MnO3 nanoparticles

“…3 is the result of temperature dependence of magnetization for all samples under zero-field cooling (ZFC) mode and field cooling (FC) mode with a magnetic field of 500 Oe. For all samples, the weak FM at high temperature is originated from thermalactivated e g electrons between Mn 3+ and Mn 4+ [11]. For the sample S13 as shown in Fig.…”

“…Recently, quite a few experimental and theoretical studies focusing on the size effects of perovskite manganites were reported, in which some interesting effects associated with the downsizing of the materials to tens of nanometers were revealed [1][2][3][4][5]. La 1Àx Sr x MnO 3 is a type of canonical model with large bandwidth.…”

Particle size dependence on the structural, transport and optical properties of charge-ordered Pr0.6Ca0.4MnO3

“…Doped perovskite manganites exhibit strong dependence of their properties on the particle size of the systems, especially on the charge ordered state. Evidence of the suppression of the antiferromagnetic charge ordered state in the Pr 0.5 Sr 0.5 MnO 3 and Nd 0.5 Sr 0.5 MnO 3 nanoparticles was obtained [21,22]; the charge ordered and antiferromagnetic phase transition observed in thebulk Nd 0.5 Ca 0.5 MnO 3 disappeared in the nanoparticles and ferromagnetic metallic phase emerged [23].The strong charge ordered state in bulk Pr 0.5 Ca 0.5 MnO 3 , where a strong magnetic field is necessary to suppress the charge ordered antiferromagnetic insulating phase and to develop ferromagnetic metallic phase, has also been reported to be suppressed in both Pr 0.5 Ca 0.5 MnO 3 nanoparticles and nanowires [24,25].So from these reports, it has been observed that the reduction of particle size can suppress the formation of the CO state. However, this conclusion is not applicable to all the CO systems.…”

Electron Magnetic Resonance Studies of Nanosized Nd0.65Ca0.35 Mn1−xCrxO3 (x = 0, 0.06, 0.1) Manganite

“…[1][2][3]. The charge-ordered (CO) phase, which is frequently observed in doped manganites is known to be destabilized by external perturbations such as magnetic field [4], electric field [5], hydrostatic and chemical pressure [6], substitution at the 'Mn' site [7], substitution at 'A' site [8] and by reducing the particle size to nanometer range [9][10][11].…”