Charge-ordering breakdown dynamics and ferromagnetic resonance studies of-site Cu diluted PrSrMnO.

Here, we report the influence of Jahn-Teller active Cu substitution on the charge-ordering (CO) characteristics of one of the well-known manganite PrSrMnO(S55) with a distorted tetragonal structure. Magnetization studies unveil a complex magnetic phase diagram for S55, showing distinct temperature ranges corresponding to various magnetic phases: a ferromagnetic phase dominated by the Double Exchange interaction with∼ 220.5 K, an antiferromagnetic phase below∼ 207.6 K induced by CO with a transition temperature of∼ 210 K consistent with the specific heat(T) data, and a mixed phase in the range<<due to the competitive interplay of these two interactions. Dilute substitution of Cu at the Mn-sites disrupts the robust charge-ordered state, leading to enhanced ferrimagnetic order with∼273 K and significant magnetocrystalline anisotropy as confirmed by ferromagnetic resonance (FMR) studies. The Cu-substituted system displays a distinct cationic distribution compared to the pristine S55, contributing to its diverse magnetic structure. Our findings also reveal the irreversible metamagnetic transition (∼ 8.85 kOe at 180 K) associated with the CO phenomena in S55 and the first-order nature of the phase transition across. The magnetic heat capacity critical analysis ((-)) yields the exponent,0.097 (0.154) in the region>(<) consistent with the magnetic structure. The temperature dependence of FMR resonance field Δ(), peak-to-peak width(), and Gilbert damping factor() show clear anomalies across the magnetic transitions signifying the important role of admixtured (3+/4+) electronic state of Mn. Additionally, a strong correlation between the FMR(T) and switchable magnetic entropy change (-8/+ 3 J kgKfor90 kOe) has also been established in S55.