Oxygen Isotope Effect in Cr- and Ru-Doped Pr0.5Ca0.5MnO3 Manganites
The effect of 16О → 18О isotope substitution on the properties of Pr0.5Ca0.5MnO3 manganites doped by Cr and Ru is studied. In these compounds, chromium and ruthenium favor (i) the suppression of a charge-ordered state and (ii) the formation of a ferromagnetic metallic phase. The 16О → 18О isotope substitution leads to the growth of the charge-ordering transition temperature (TCO), and to the lowering of ferromagnetic transition temperature (TFM) accompanied by a decrease in the content of ferromagnetic phase. The difference in the behavior of the Cr- and Ru-substituted samples is analyzed.
N.A. Babushkina et al., "Oxygen Isotope Effect in Cr- and Ru-Doped Pr0.5Ca0.5MnO3 Manganites", Solid State Phenomena, Vols. 152-153, pp. 127-130, 2009