Abstract
This study reports the structural, morphological, and magnetic properties of ruthenium doping at the manganese site in Pr0.67Ba0.33MnO3 manganites. Rietveld refinement X-ray powder diffraction (XRD) data show that Pr0.67Ba0.33MnO3 and Pr0.67Ba0.33Mn0.9Ru0.1O3 crystallize in an orthorhombic perovskite structure with the Pnma space group. Doping with Ru yields an increment in the lattice parameter and unit cell volume. In addition, small changes in the Mn–O–Mn bond angle and bond distance are observed. Field emission scanning electron microscopy (FESEM) is used to examine the surface morphology of the samples. Fourier transform infrared spectroscopy (FTIR) reveals that the Mn–O and metal–oxygen bonds appear at the 600 and 900 cm−1 bands, respectively. The AC magnetic susceptibility measurement studies confirm that a paramagnetic (PM) to ferromagnetic (FM) transition exists at 130 and 153 K for the Pr0.67Ba0.33MnO3 and Pr0.67Ba0.33Mn0.9Ru0.1O3 samples, respectively.
Highlights
Introduction(A = La, Pr, Nd, and M = Ca, Sr, Ba) are gaining increasing attention because the compounds in this family exhibit a colossal magnetoresistance (CMR) effect, metal-to-insulator transition, charge ordering, and phase separation, as well as a remarkable variety of structural, physical, and magnetic properties [1,2,3]
Doped perovskite manganite compounds with the general chemical formula A1−x Mx MnO3 (A = La, Pr, Nd, and M = Ca, Sr, Ba) are gaining increasing attention because the compounds in this family exhibit a colossal magnetoresistance (CMR) effect, metal-to-insulator transition, charge ordering, and phase separation, as well as a remarkable variety of structural, physical, and magnetic properties [1,2,3]
A strong spin phonon interaction arises from deformation of the MnO6 octahedron, which plays an important role in the lattice, magnetic, and electrical behavior of these materials
Summary
(A = La, Pr, Nd, and M = Ca, Sr, Ba) are gaining increasing attention because the compounds in this family exhibit a colossal magnetoresistance (CMR) effect, metal-to-insulator transition, charge ordering, and phase separation, as well as a remarkable variety of structural, physical, and magnetic properties [1,2,3]. The compounds exhibit a range of structural, electronic, and magnetic phase transitions by substituting different ions at the A or Mn sites. CMRs which have interesting structural and physical properties that are correlated with the coupling within the spin phonon interaction, lattice, and orbital degrees of freedom between Mn3+ and Mn4+. Several studies on manganites have stated that the doping of other elements at the Mn site is vital to the resulting new exchange interactions between Mn and doped transition metal ions [4,5]. Most of the doping on the Mn site decreases with the transition temperature due to weakening of the double exchange interaction [6,7]
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