Study of structural, Griffiths phase, and magneto-crystalline anisotropy in Pr_0.47La_0.20K_0.33Mn_0.91Cu_0.09O₃ perovskite manganite

This study examined the structural and magnetic properties of polycrystalline perovskite Pr_0.47La_0.20K_0.33Mn_0.91Cu_0.09O₃. Through Rietveld refinement of powder X-ray diffraction data, it was determined that the material possesses an orthorhombic structure with space group Pnma. At the Curie temperature ( \({\text{T}}_{\text{C}}=177.80\text{ K}\) ${\text{T}}_{\text{C}}=177.80\text{K}$ ), the magnetization behavior shifted from paramagnetic to ferromagnetic, revealing a Griffiths phase characterized by downward divergence from the Curie–Weiss law. Key parameters such as the Curie temperature T_C, the Griffiths temperature ( \({T}_{G}\) $T_G$ ), and the Griffiths exponent (λ) were determined to be 177.80 K, 287.85 K, and 0.0762, respectively. To analyze the saturation magnetization data at higher magnetic fields using the law of approach to saturation (LAS) model, we can determine the magneto-crystalline anisotropy constant (K₁). The value of (K₁) was estimated to be approximately 1.27 × 10⁶ erg/cm³ = 1.27 × 10⁵ J/m³. These findings suggest that the Pr_0.47La_0.20K_0.33Mn_0.91Cu_0.09O₃ sample shows promise as a candidate for multifunctional devices.