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Evidences of a consolute critical point in the Phase Separation regime of La(5/8-y)Pr(y)Ca(3/8)MnO(3) (y = 0.4) single crystals

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arxiv cond-mat/0603850 v1 pith:RLGZPUUE submitted 2006-03-31 cond-mat.str-el cond-mat.mtrl-sci

G. Garbarino , C. Acha , P. Levy , T. Y. Koo , S-W. Cheong This is my paper
classification cond-mat.str-elcond-mat.mtrl-sci
keywords temperaturecriticalregimeconductingconsolutecrystalsdependentelectric
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We report on DC and pulsed electric field sensitivity of the resistance of mixed valent Mn oxide based La(5/8-y)Pr(y)Ca(3/8)MnO(3) (y = 0.4) single crystals as a function of temperature. The low temperature regime of the resistivity is highly current and voltage dependent. An irreversible transition from high (HR) to a low resistivity (LR) is obtained upon the increase of the electric field up to a temperature dependent critical value (V_c). The current-voltage characteristics in the LR regime as well as the lack of a variation in the magnetization response when V_c is reached indicate the formation of a non-single connected filamentary conducting path. The temperature dependence of V_c indicates the existence of a consolute point where the conducting and insulating phases produce a critical behavior as a consequence of their separation.

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