acta de conferencia
"Current-induced effects in La5/8-yPryCa3/8MnO3 (y=0.35) single crystals"
G. Garbarino, M. Monteverde, C. Acha, P. Levy, M. Quintero, T.Y. Koo and S.-W. Cheong
Proc. of the Workshop "At the Frontiers of Condensed Matter II - Magnetism, Magnetic Materials, and their Applications", Buenos Aires, Argentina, June 22-26, 2004. Ed. C. Saragovi, J. Guevara, R. Weht, A.M. Llois and M.T. Causa
Physica B Condens. Matter. 354(1-4) (2004) 16-19
Abstract
DC electrical current-dependent resistance and pulsed current.voltage characteristics as a function of temperature of mixed valent Mn oxide-based La5/8-yPryCa0.375MnO3 (y=0.35) single crystals are reported. We find that the low-temperature regime of this material is strongly current dependent. For small current densities (~10 µA/cm2), the metal.insulator transition related to the low-temperature enlargement of the ferromagnetic fraction is not observed down to 10 K. Higher current densities causes a large decrease of the resistance, which is temperature dependent and exhibits memory effects. Our results are interpreted within a scenario of strong competition between charge and ferromagnetic ordering.
DIVISION MATERIA CONDENSADA
