Magnetic properties and charge ordering in Pr0.75Na0.25MnO3 manganite

Revival of Ferromagnetic-Metallic Phase and Emergence of Griffiths Phase via Ni and Cr Substitution in Charged-Ordered Pr0.75Na0.25MnO3 Manganite

“…62). The orthorhombic structure obtained in this study is consistent with prior findings on Pr 0.75 Na 0.25 MnO 3 manganites using the same refinement technique [15][16]. 3 ulated intensities of the corresponding peaks at room temperature.…”

“…The X-ray diffraction patterns of the ples (Figure 1) were subjected to final refinement at room temperature, revealing that all the hesized samples were single-phased and exhibited orthorhombic symmetry with Pnma space group 62). The orthorhombic structure obtained in this study is consistent with prior findings on 5Na0.25MnO3 manganites using the same refinement technique [15][16]. Table 1 provides a list of lattice parameters, calculated unit cell volume (V) and chi-squared (χ 2 ) values obtained from the final refinement of Pr0.75Na0.25MnO3, Pr0.75Na0.25Mn0.97Ni0.03O3 and Pr0.75Na0.25Mn0.97Cr0.03O3 samples.…”

“…3 ulated intensities of the corresponding peaks at room temperature. The patterns reveal that all ple peaks appear at comparable angles and positions to those reported earlier for the parent pound of Pr0.75Na0.25MnO3 manganite [15][16]. The Rietveld method was employed to refine the data of the samples using the General Structure Analysis System (GSAS) program [29], the GUI package, and VESTA [30].…”

“…Figure 1 shows the XRD patterns and refinement for Pr 0.75 Na 0.25 MnO 3 , Pr 0.75 Na 0.25 Mn 0.97 Ni 0.03 O 3 and Pr 0.75 Na 0.25 Mn 0.97 Cr 0.03 O 3 samples, including the Bragg reflection positions, and the measured and calculated intensities of the corresponding peaks at room temperature. The patterns reveal that all sample peaks appear at comparable angles and positions to those reported earlier for the parent compound of Pr 0.75 Na 0.25 MnO 3 manganite [15][16]. The Rietveld method was employed to refine the XRD data of the samples using the General Structure Analysis System (GSAS) program [29], the EXPGUI package, and VESTA [30].…”

“…Among these factors, CO has gained significant attention owing to its insulating and antiferromagnetic (AFM) behavior [12][13][14]. The CO state is observed in manganites doped with monovalent alkaline ions at a doping level of x = 0.25, such as in Pr 0.75 Na 0.25 MnO 3 (PNMO) [15][16][17]. The Coulomb interaction between Mn ions and the JT effect of Mn 3+ ions lead to an alternately ordered arrangement of Mn 3+ and Mn 4+ ions in a 1:1 ratio at lattice sites, resulting in the localization of charge carriers and restricting their mobility from hopping between lattice sites, which gives rise to an insulating behavior of the compound.…”