Abstract
A study on the effect of Fe doping on the magnetic properties of La 0.7 Pb 0.3 Mn 1 - x Fe x O x , x = 0 and x = 0.2 perovskites is conducted using muon spectroscopy and macroscopic static magnetization measurements. For x = 0 , magnetization curves show a clear ferromagnetic component while a 20% Fe doping leads to the appearance of a kink in zero-field curves at low temperatures, attributed to progressive spin freezing together with a reduction of the ferromagnetic component. On dynamic grounds, we show that this effect translates into the appearance of non-exponential relaxation as T c is crossed from above.
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