PHYSICS OF METALS AND METALLOGRAPHY, v.123, no.3, pp.310 - 313
Abstract
In Pr0.7Ca0.15Ba0.15MnO3 manganite, the spin dynamics is studied by the method of electron paramagnetic resonance (EPR). The analysis showed that at the temperature T-L approximate to T-min, which corresponds to the minimal width of the EPR line, the shape of lines of absorption spectra is perfectly described by a single Lorentzian. At other temperatures (not T-L), the absorption lines of the EPR spectra are asymmetric, which is caused by their exchange broadening at T < T-L or hopping conductivity at T > T-L.