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Ultrasonic attenuation and phase velocity measurements have been carried outin the ferromagnetic perovskites La_{2/3}Ca_{1/3}MnO_3 andLa_{2/3}Sr_{1/3}MnO_3. Data show that the transition at the Curie temperature,T_C, changes from first- to second-order as Sr replaces Ca in the perovskite.The compound with first-order transition shows also another transition at atemperature T* > T_C. We interpret the temperature window T_C < T < T* as aregion of coexistence of a phase separated regime of metallic and insulatingregions, in the line of recent theoretical proposals.Comment: 4 pages, 2 figure

Ultrasonic evidence of an uncorrelated cluster formation temperature in manganites with first-order magnetic transition at the Curie temperature