Abstract
In order to experimentally probe into the complicated interaction between charge ordering and spin ordering in manganites, two sets of samples Nd0.5Sr0.5Mn1−xGaxO3 (NSMGO) and Nd0.5Sr0.5Mn1−yCryO3 (NSMCO) (0.0 ⩽ x, y ⩽ 0.075), have been studied by means of electrical transport, magnetization, electron spin resonance and transmission electron microscopy analysis. By comparing the influence of Cr-doping and Ga-doping in the Nd0.5Sr0.5MnO3 (NSMO) system, large difference between the evolution of charge ordering temperature Tco in the Cr-doping and the Ga-doping cases is found. In the NSMCO system, the CE-type antiferromagnetic (AFM)/charge ordering (CO) phase disappears with only 2.5 percent Cr doping; but in the NSMGO system, the CE-type AFM/CO phase always exists. This phenomenon indicates that the charge ordering formation is dominated by the spin ordering. As a result, it is experimentally proved that there is strong coupling interaction between charge ordering and spin ordering in NSMO system.
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