title: Study of the relationship between electrical and magnetic properties and Jahn-Teller distortion in R(0.7)Ca(0.3)Mn(0.95)Fe(0.05)O(3) perovskites.
abstract: In this work structural, magnetic and electrical properties of R(0.7)Ca(0.3)Mn(0.95)Fe(0.05)O(3) (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)O(6) octahedron on the basis of non-zero nuclear quadrupole interactions for high-spin Fe(3+) ions. It was found that the local structural distortion decreases significantly on replacing Pr(3+) by Nd(3+). 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.
authors.forename: E K
authors.initials: EK
authors.lastname: Abdel-Khalek
authors.forename: W M
authors.initials: WM
authors.lastname: El-Meligy
authors.forename: E A
authors.initials: EA
authors.lastname: Mohamed
authors.forename: T Z
authors.initials: TZ
authors.lastname: Amer
authors.forename: H A
authors.initials: HA
authors.lastname: Sallam