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Study of the relationship between electrical and magnetic properties and Jahn–Teller distortion in R0.7Ca0.3Mn0.95Fe0.05O3 perovskites

In this work structural, magnetic and electrical properties of R0.7Ca0.3Mn0.95Fe0.05O3 (R = Pr and Nd) perovskite manganites are presented. Structural characterization of these compounds shows that both have orthorhombic (Pbnm) phase. The Mössbauer spectra show clear evidence of the local structural distortion of the Mn(Fe)O6 octahedron on the basis of non-zero nuclear quadrupole interactions for high-spin Fe3+ ions. It was found that the local structural distortion decreases significantly on replacing Pr3+ by Nd3+. This replacement dependence of the Jahn–Teller coupling strength estimated from the Mössbauer results was found to be consistent with the electrical and magnetic properties.