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
G. Garbarino, C. Acha, P. Levy, T. Y. Koo, S-W. Cheong
Abstract
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 (Vc). The current-voltage characteristics in the LR regime as well as the lack of a variation in the magnetization response when Vc is reached indicate the formation of a non-single connected filamentary conducting path. The temperature dependence of Vc 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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