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The effect of disorder on the critical properties of the ferromagnetic phasetransition in colossal magnetoresistive manganite La0.67Ca0.33MnO3 has beenstudied by substituting Ga for Mn. It is found that, upon 10% Ga substitution,the peak in the specific heat at the Curie point T_C changes drastically andappears as a small anomaly. Static magnetization data analyzed in theasymptotic critical region using modified Arrott plots and the Kouvel-Fishermethod give values for the critical exponents beta=0.387(6), gamma=1.362(2),and delta=4.60(3). The results show that the first-order transition inLa0.67Ca0.33MnO3 becomes continuous by Ga substitution. The critical propertiesof the rounded transition in La0.67Ca0.33Mn0.9Ga0.1O3 suggest that the magneticsubsystem in this mixed-valent perovskite is close to that of a conventionalisotropic ferromagnet belonging to the Heisenberg universality class withshort-range interactions. It is concluded that the first-order magnetictransition in pure La0.67Ca0.33MnO3 is induced by fluctuations from a competingmode, which couples to the magnetic subsystem.

physical review. b, condensed matter and materials physics

Rounding of a first-order magnetic phase transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow></mml:math>-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.67</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml…

Rounding of a first-order magnetic phase transition inGa-dopedLa0.67Ca