Inducement of ferromagnetic–metallic phase and magnetoresistance behavior in charged ordered monovalent-doped Pr0.75Na0.25MnO3 manganite by Ni substitution

Comparative Study on Structural, Electrical Transport and Magnetic Properties of Cr-Doped in Charge-Ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 Manganites

“…Figure 3 shows the temperature dependence of electrical resistivity in the temperature range 50-300 K for Pr0.75Na0.25Mn1-xCrxO3 (x = 0, 0.02 and 0.04) under zero magnetic field. The sample with x = 0 exhibit an insulating behavior without showing any transition of MI consistent with the previous study [26]. A MI transition was observed at 120 K and 122 K for x = 0.02 and x = 0.04 samples respectively.…”

“…Temperature dependence of the AC susceptibility (χ') measurement for all samples of Pr0.75Na0.25Mn1-xCrxO3 manganites was shown in Figure 5. The parent compound (x = 0) showed paramagnetic (PM) to antiferromagnetic (AFM) transition with Neel temperature, TN ~129 K in line with a previous suggestion for by [26]. Increasing of Cr content induced paramagnetic (PM) into ferromagnetic (FM)-like with Curie temperature, TC increases from 132 K (x = 0.02) to 141 K (x = 0.04) indicated the suppression of CO.…”

Possibility of controlling the conduction mechanism by choosing a specific doping element in a praseodymium manganite system

“…It had shown that the substitution of the manganese affects mainly the Mn 3+ /Mn 4+ ratio, leads to modify the relative cooling power (RCP), the magnetoresistance effects and the transport properties of manganites. [22][23][24][25][26][27][28][29][30][31][32] Also, the substitution by a transition metal like iron element can block the electron transfer between Mn 3+ and Mn 4+ ions. Numerous electrical studies had shown that the substitution of the manganese affect strongly the electrical properties.…”

“…It affects strongly the physical properties of manganites. 31,41,42 Thus, it modies the Mn 3+ -Mn 4+ ratio and weakens the double exchange interaction. 31,41,42 It reduces the Curie temperature, the magnetization and leads to the modication of the resistivity.…”

Observation of Charge Ordering Signal in Monovalent Doped Nd0.75Na0.25-xKxMn1O3 (0 ≤ x ≤ 0.10) Manganites

“…CMR effect is related to manganese-based perovskite oxides where the drastic change of their electrical resistivity behaviour in presence of magnetic field and can be interrelated to antiferromagnetic (AFM) super-exchange [7,8] , Jahn-Teller (JT) effect [9] and charge ordering (CO) state [10,11]. In particular, the Nd0.75Na0.25MnO3 compound has received fair notable attention as it exhibits a CO transition at relatively high temperature, TCO~170 K compared to AFM interaction [12,13] For instance, K substitution in Pr0.75Na0.25-xKxMnO3 revealed a transition of metal-insulator (MI) as well as ferromagnetic to paramagnetic with increasing temperature from 50 K to 300 K suggestively due to the reduction in CO domain as a result of random distribution at A-site cations [14]. In addition, Shaikh et al reported that all samples of La1-xAgxMnO3 induced a MI transition temperature suggested due to the destruction of CO state [9].…”