The effect of Ni doping on the magnetic and transport properties in Pr 0.5 Ca 0.5 Mn 1- x Ni x O 3 manganites Academic Article uri icon

abstract

  • Structural, magnetic, and transport properties in Pr0.5Ca0.5Mn1−xNixO3 (x=0, 0.04, 0.07, 0.1) were investigated. It is remarkable that low Ni-doping levels at Mn sites induce drastic changes in the physical properties of Pr0.5Ca0.5MnO3 due to melting of the charge ordered state and the consequent capability of Ni ions to create ferromagnetic (FM) clusters. It was found that oxygen deficient samples (3−δ=2.84±0.03) exhibit resistivities higher by four to five orders than that of their stoichiometric counterparts and do not exhibit metal-insulator transition. Only a stoichiometric x=0.04 sample with higher content of the FM phase shows metal-insulator transition at T≈80 K. A change in slope in the zero field cooling magnetization curve observed for x=0.04 and 0.07 (may be slightly oxygen deficient samples) are indicative of spin-glass-like state. Applied hydrostatic pressure of about 10 kbars reduces the temperature of charge ordering in x=0 sample by about 10 K indicating on pressure induced suppression of...

publication date

  • January 1, 2009