Ru doping in charge-ordered Pr_0.75Na_0.25Mn_1-xRu_xO₃ (x = 0–0.1) manganites was studied to investigate its effect on structure, electrical transport, magnetic properties, and magnetotransport properties. DC electrical resistivity (ρ), magnetic susceptibility, and χ’ measurements showed that sample x = 0 exhibits insulating behavior within the entire temperature range and antiferromagnetic (AFM) behavior below the charge-ordering (CO) transition temperature T_CO of 221 K. Ru⁴⁺ substitution (x>0.01) suppressed the CO state, which resulted in the revival of paramagnetic to ferromagnetic (FM) transition at the Curie temperature T_c, increasing from 120 K (x = 0.01) to 193 K (x = 0.1). Deviation from the Curie–Weiss law above T_c in the 1/χ’ versus T plot for x = 0.01 doped samples indicated the existence of Griffiths phase with Griffith temperature at 169 K. Electrical resistivity measurements showed that Ru⁴⁺ substitution increased the metallic-to-insulating transition temperature T_MI from 144 K (x = 0.01) to 192 K (x = 0.05) due to enhanced double-exchange mechanism, but T_MI decreased to 176 K (x = 0.1) probably due to the existence of AFM clusters within the FM domain. The present work also discussed the possible theoretical models at the resistivity curve of Pr_0.75Na_0.25Mn_1-xRu_xO₃ (x = 0–0.1) for the entire temperature range.

研究了电荷掺杂的Pr _0.75 Na _0.25 Mn _{1- x} Ru _x O ₃（x = 0-0.1）锰中的Ru掺杂，以研究其对结构，电传输，磁性能和磁传输性能的影响。直流电阻率（ρ），磁化率和χ'测量表明，样品x = 0在整个温度范围内均表现出绝缘行为，并且在221 K的电荷有序（CO）转变温度T _CO以下表现出反铁磁（AFM）行为 。 Ru ⁴⁺取代（x> 0.01）会抑制CO态，从而导致居里温度T _c处的顺磁到铁磁（FM）的恢复，从120  K（x = 0.01）增加到193  K（x = 0.1）。对于x = 0.01的掺杂样品，在1 / χ'相对于T曲线上的T _c上方居里-魏斯定律的偏差表明存在格里菲斯相，格里菲斯温度为169K 。电阻率测量表明Ru ⁴⁺取代增加了金属含量-绝缘转变温度T _MI从144 K（x  = 0.01）到192  K（x = 0.05），这归因于双重交换机制的增强，但T _MI降至176  K（x = 0.1），这可能是由于FM域中存在AFM簇。本文还讨论了在整个温度范围内Pr _0.75 Na _0.25 Mn _{1- x} Ru _x O ₃（x = 0-0.1）的电阻率曲线上可能的理论模型。