Pr0.7Ca0.15Ba0.15MnO3 manganite: Electron paramagnetic resonance, conductivity and susceptibility

Magnetic susceptibility and electron magnetic resonance study of monovalent potassium doped manganites Pr0.6Sr0.4−xKxMnO3

“…1). The similar behavior was reported for the Na doped Pr0.6Sr0.4−xNaxMnO3 manganites [10] and for Pr0.7Ca0.15Ba0.15MnO3 manganites [27][28][29]. The ΔHp-p (T) minimum shifts towards lower temperatures with raising K content.…”

“…The difference in activation energies may be attributed to different "frequency windows" specific for magnetic resonance and susceptibility techniques. Thus, the last equation being similar to that one describing the adiabatic polaron conductivity [27], seems to be in favor to the polaron mechanism in linewidth dependence in paramagnetic phase.…”

Analysis based on scaling relations of critical behaviour at PM–FM phase transition and universal curve of magnetocaloric effect in selected Ag-doped manganites

“…It was also suggested that A-site ionic size mismatch may cause a glass-like disorder state, leading to a highly magnetic inhomogeneity. 62 Recently, Ulyanov and co-workers 64 have used the electron-spin-resonance spectroscopy for studying praseodymium manganites and found FM and anti-FM interactions associated with both ion types (Pr 3+ and Mn 3+,4+ ) persist in it throughout the temperature range, even above critical temperature. For both wide- and narrow-bandwidth manganites, several investigations of resonant signals (related to the decrease of resonant intensity, the broadening of linewidth, and temperature dependences of the resonant field) in the paramagnetic region show the presence of FM clusters, spin–phonon and/or spin–orbit interactions.…”

“…For both wide-and narrowbandwidth manganites, several investigations of resonant signals (related to the decrease of resonant intensity, the broadening of linewidth, and temperature dependences of the resonant eld) in the paramagnetic region show the presence of FM clusters, spin-phonon and/or spin-orbit interactions. 64,65 These factors may be present in our Pr 0.5 Sr 0.5Àx Ag x MnO 3 , which lead to the magnetic inhomogeneity, and thus inuence the critical parameters. It is necessary to emphasize that crystalline characteristics (such as the single crystal and poly-crystalline) also play a signicant role affecting the critical behaviour.…”