EPR and resistivity study of Pr/sub 0.7/Ba/sub 0.3/MnO/sub 3/ manganite

A variable temperature EPR study of the manganites (La1/3Sm2/3)2/3SrxBa0.33−xMnO3 (x=0.0, 0.1, 0.2, 0.33): Small polaron hopping conductivity and Griffiths phase

“…The present results on the manganite samples are in accordance with those reported by Ulyanov et al[20] for the manganite Pr 0.7 Ba 0.3 MnO 3 , where similar activation energies were obtained, estimating E s from the resistivity data to be 0.16 eV and E a values from the EPR linewidth and intensity data to be 0.09 and 0.11 eV, respectively.…”

Structural and Magnetic Properties Control of Pr0.7Ba0.3MnO3 with Sr-Doping

“…The experimental and theoretical magnetic moment values are listed in Table 2. The reason for a far difference between experimental and theoretical values may be caused by the spin-lattice interaction in the vicinity of T C [20]. Besides, the complicated occupation at A-site contributes to promote the FM inhomogeneity and enhance spin-lattice interaction in Pr 0.7 Sr x Ba 0.3 -x MnO 3 compounds.…”

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

“…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.…”