“Evidences of a consolute critical point in the Phase Separation regime of La5/8-yPryCa3/8MnO3 single crystals”,

G. GARBARINO, C. ACHA, P. LEVY, T. Y. KOO AND S-W.CHEONG

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

The APS

Lugar: The APS; Año: 2006 vol. 74 p. 100401 - 100401

0163-1829

We report on the 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 to low resistivity
LRis 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-singly-connected filamentary conducting path. The obtained temperature dependence of V c has a critical behavior similar to the one observed in binary liquid mixtures near their consolute point.