The effects of Ca substitutions on the structure, magnetism and electrical properties of YCrO 3 ceramics are investigated by X-ray diffraction, magnetic susceptibility and electrical conductivity measurements. The cell volume decrease occurs through the change from Cr(III) to Cr(IV) as a result of the charge compensation of the Ca doping. No changes are observed in the antiferromagnetic transition temperature while strong changes are observed in the transport measurements due to Ca content. The increase of the electrical conductivity as well as the decrease of the activation energy is caused by the formation of the small-polarons localized in the OCrO lattice distortion. The origin of small-polarons in the undoped sample is different in nature from the calcium doped. "Local non-centrosymmetry" is the source of the small-polaron formation in undoped sample, while the change from Cr(III) to Cr(IV) through the charge compensation of Ca(II) in the Y(III) site is the source of small-polarons formations. The decrease of the average bond length CrO as well as effective moments in the paramagnetic state and the increase of the electrical conductivity are clear evidence that the Ca doping induces localized polarons, which in turn, these quasiparticles move from site to site by a thermally activated process in the doped YCrO 3 compound. Here, we also discuss a possible mechanism of small-polaron injections in YCrO 3 matrix.
Bibliographical noteFunding Information:
AD thanks to DGAPA-UNAM through project IN112909 and also the Scientific Coordination-UNAM in the program ‘Intercambio Académico’. RE thanks DGAPA_UNAM project IN100711, CONACyT financial support, to BISNANO, and to the Instituto de Ciencias del Departamento del D. F., Cd. de México. FM thanks the partial support of DGAPA-UNAM project IN111511. We also thank to I. Gradilla (CNyN), E. Aparicio (CNyN), J. Palomares (CNyN), P. Casillas (CNyN) and E. Flores (CNyN) for their technical help.
- Electrical conductivity
- Hopping process
- Mechanism of conductivity