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