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We report on DC and pulsed electric field sensitivity of the resistance ofmixed valent Mn oxide based La(5/8-y)Pr(y)Ca(3/8)MnO(3) (y = 0.4) singlecrystals as a function of temperature. The low temperature regime of theresistivity is highly current and voltage dependent. An irreversible transitionfrom high (HR) to a low resistivity (LR) is obtained upon the increase of theelectric field up to a temperature dependent critical value (V_c). Thecurrent-voltage characteristics in the LR regime as well as the lack of avariation in the magnetization response when V_c is reached indicate theformation of a non-single connected filamentary conducting path. Thetemperature dependence of V_c indicates the existence of a consolute pointwhere the conducting and insulating phases produce a critical behavior as aconsequence of their separation.Comment: 5 pages, 6 figures, corresponding author: C. Acha (acha@df.uba.ar

physical review. b, condensed matter and materials physics

Evidence of a consolute critical point in the phase separation regime of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>5</mml:mn><mml:mo>∕</mml:mo><mml:mn>8</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Pr</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>∕</mml:mo><mml:mn>8</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>…

Evidence of a consolute critical point in the phase separation regime ofLa5∕8−yPryCa3∕8…