Abstract
The critical properties of the ferromagnetic insulating system LaMn1−xTixO3 (0.05⩽x⩽0.2) are investigated based on the static magnetization measurements around Curie temperature TC. The values of critical exponents, derived from the magnetic data using the Kouvel-Fisher method, yield 0.359⩽β⩽0.378, 1.24⩽γ⩽1.29, and 4.11⩽δ⩽4.21 with a TC of 95–173K. The exponent values are close to those expected for three-dimensional Heisenberg ferromagnets with short-range interactions, and the magnetic transition is understood in the context of Griffiths phase, arising from the random-temperature effects.
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