Abstract: Study of the nonlinear magnetic susceptibility, ??nl, of La0.7Pb0.3(Mn1?xFe??)O3 manganite reveals that, as in an archetypical spin glass (SG), ??nl in La0.7Pb0.3Mn0.8Fe0.2??3 diverges at the SG freezing temperature, ?????=?80.0(5)K, with a critical exponent ??=?1.80(5) and satisfies the static and dynamic scaling equations of state with the order?parameter critical exponent ??=?0.56(4) and the dynamic critical exponent z????=?10.0(5). The SG behaviour stems from the competition between the ferromagnetic double?exchange and antiferromagnetic superexchange interactions.

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