Abstract
AbstractAmong the wide variety of colossal magnetoresistance materials the Pr‐compositions occupy some special places. Namely, in zero magnetic field the Pr1−yCayMnO3 samples are insulators for any level of Ca doping and show low field hysteresis. Pr0.7Ba0.3MnO3 composition is also insulating at low as well as at high temperatures. The combined Pr‐ and (Sr, Ba)‐doped perovskite‐like manganites should show interesting properties due to the large difference between the Pr and Sr, Ba ionic size. In this work we present an electron paramagnetic resonance (EPR) study of Pr0.7Sr0.3−xBaxMnO3 perovskite (x = 0.00, 0.15 and 0.30). We observed that the intensity of the EPR line decreases exponentially with temperature. The activation energy values derived from the temperature dependencies of EPR line intensity equals 0.16 eV, 0.09 eV and 0.08 eV for the x = 0.00, 0.15 and 0.30 compositions, respectively. The temperature dependence of the EPR linewidth showed a minimum near the TC. The temperature and concentration dependencies of EPR linewidth and line intensity will be discussed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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