The Shape of Electron Paramagnetic Resonance Lines of Pr0.7Ca0.15Ba0.15MnO3 Manganite

In Pr 0.7 Ca 0.15 Ba 0.15 MnO 3 manganite, the spin dynamics is studied by the method of electron paramagnetic resonance (EPR). The analysis showed that at the temperature Т L ≈ 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 Т L ), the absorption lines of the EPR spectra are asymmetric, which is caused by their exchange broadening at Т < Т L or hopping conductivity at T > Т L .