Magnetic and electronic properties of charge ordered Nd0.8Na0.2MnO3

Magnetic properties of Nd1−xKxMnO3 compounds

“…The typical XRD pattern along with Rietveld refinement is shown in Table 1. The lattice parameters are found to be larger than those reported for Na-and Ag-doped Nd-Mn-O series [24][25][26]31].The lattice parameters a and c are found to increase with doping and on the other hand no systematic variation in parameter b has been observed. This can be understood on the basis of competition between larger K 1+ ions replacing Nd 3+ ions and the generation of smaller Mn 4+ ions at the expense of larger Mn 3+ ions.…”

“…It was also predicted that in these materials, Nd ions order antiferromagnetically with spin canting. Recently, the monovalent alkali-ion-doped Nd 1Àx Na x MnO 3 series was studied by a few groups for x ¼ 0.1-0.25 and found that these materials exhibit charge ordering at around 180 K followed by weak FM transition at 110 K [24][25][26]. The electrical resistivity follows semiconducting behavior without any metal-insulator transition.…”

Magnetic properties of Nd1−xAgxMnO3compounds

“…It was also predicted that, in these materials, Nd ions order antiferromagnetically with spin canting. Recently the monovalent alkali-ion-doped, Nd 1−x Na x MnO 3 series was studied by a few groups for x = 0.1-0.25 and found that these materials exhibit charge ordering at around 180 K followed by a weak FM transition at 110 K [24][25][26]. The electrical resistivity follows semiconducting behavior without any metal-insulator transition.…”

Magnetic, electrical transport and electron spin resonance studies of ferromagnetic insulating manganites Nd0.85Na0.15MnO3

“…For example, Nd 1Àx Ca x MnO 3 with 0pxp0:25 show FM semiconducting behavior, and those with x40:80 exhibit antiferromagnetic semiconducting ground state at low temperature, while the samples with 0:30pxp0:80 show a rich variety of phenomena [6]. Furthermore, for the Nd-based manganites doped with univalent alkali metal cations, we reported that Nd 1Àx Na x MnO 3 exhibit the charge ordering transition at 155 and 170 K for x with 0.20 and 0.25, respectively [7][8][9]. Below 130 K, both samples tend to be intrinsically inhomogeneous, i.e, FM metal components and PM insulator domains coexist in these systems.…”

“…Similar results were reported in Pr 0. 7 The inset of Fig. 7 displays the log(r/T) versus 1000/T plots for the sample.…”