The influence of disorder on critical behavior near the paramagnetic to ferromagnetic phase transition temperature in (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 doped manganite

•The critical behavior is sensitive to the disorder.•The critical exponents not fit with any model for J4 and J5 samples.•The scaling plots show that the critical exponents are reliable.•The Griffiths phase and metamagnetic behavior lead to novel critical exponents.

The (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 have been elaborated by the solid-state method and checked by X-ray diffraction. Close to magnetic temperature transition, the order transition and the critical behavior are investigated by dc magnetization measurements versus x and y compositions. Using various techniques such as modified Arrott plots, Kouvel–Fisher method, and Widom scaling relation, the values of TC ferromagnetic transition temperature, as well as the β, γ and δ critical exponents are estimated. The scaling plots show that the obtained values of the critical exponents are reliable. As main results, metamagnetic behavior and Griffiths phase were observed in these compounds pointing out to unconventional critical exponent.

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