Página Inicial CNEA Laboratorio TANDAR Página Inicial TANDAR Historia del acelerador TANDAR Web interno Web mail
Inicio » Actividades I+D > Publicaciones 2006 > Evidence of a consolute critical point i...
artículo con referato
"Evidence of a consolute critical point in the phase separation regime of La5/8-yPryCa3/8MnO3 (y~0.4) single crystals"
G. Garbarino, C. Acha, P. Levy, T.Y. Koo and S.-W. Cheong
Phys. Rev. B 74(10): Rapid Comm. (2006) 100401(R)/1-4
We report on the dc and pulsed electric field sensitivity of the resistance of mixed valent Mn-oxide-based La5/8-yPryCa3/8MnO3 (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 (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-singly-connected filamentary conducting path. The obtained temperature dependence of Vc has a critical behavior similar to the one observed in binary liquid mixtures near their consolute point.
Av. Gral Paz y Constituyentes, San Martín, Pcia. de Buenos Aires, Argentina
Tel: (54-11) 6772-7007 - Fax: (54-11) 6772-7121