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Colossal negative magnetoresistance \Delta \rho (T,B) observed inLa(0.6)Y(0.1)Ca(0.3)MnO(3) at B=1T shows a nearly perfect symmetry aroundT_0=160K suggesting a universal field-induced transport mechanism in thismaterial. Attributing this symmetry to strong magnetic fluctuations (triggeredby the Y substitution and further enhanced by magnetic field, both above andbelow the field-dependent Curie temperature T_C(B)=T_0), the data areinterpreted in terms of the nonthermal spin hopping and magnetization Mdependent charge carrier localization scenario leading to \Delta \rho (T,B)=-\rho_s(1-exp(-\gamma M^2)) with M(T,B)=CB/|T-T_C|^n. The separate fits throughall the data points above and below T_C yield C^{+}\simeq C^{-} and n^{+}\simeqn^{-}\simeq 1. The obtained results corroborate the importance of fluctuationeffects in this material recently found (cond-mat/9812219) to dominate itsmagneto-thermopower behavior far beyond T_C.Comment: 4 pages (REVTEX), 2 PS figures (epsf.sty); submitted to Phys.Rev.

Negative magnetoresistance in mixed-valence La0.6Y0.1Ca0.3MnO3: Evidence for charge localization governed by the Curie-Weiss law