Current-induced effects in LaPrCaMnO single crystals

G.GARBARINO; ....; PABLO LEVY; ET AL.

PHYSICA B - CONDENSED MATTER

Elsevier B.V.

Año: 2004 vol. 354 p. 1 - 1

0921-4526

Current-induced effects in La5/8-yPryCa3/8MnO3 (y=0:35) single crystals, 5/8-yPryCa3/8MnO3 (y=0:35) single crystals, G. Garbarino, M. Monteverde, C. Acha, P. Levy, M. Quintero, T.Y. Koo, S.-W. Cheong, M. Monteverde, C. Acha, P. Levy, M. Quintero, T.Y. Koo, S.-W. Cheong, S.-W. Cheong 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 mA/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. 2004 Published by Elsevier B.V.