  A field-induced crossover is observed in the resistivity and magnetization
(M) of a La(0.7)Pb(0.3)MnO(3) single crystal. The field-dependence of the
resistivity and M suggests that a small spin-canted species with
mean-field-like interactions dominates at low fields (H), whereas, individual
spins and 3D Ising/Heisenberg models describe the high-H behavior rather well.
Around the ferromagnetic transition, an H-induced destruction of the small
spin-canted magnetic polarons is accompanied by large magnetoresistance.
