Field-Induced Crossover and Colossal Magnetoresistance in La(0.7)Pb(0.3)MnO(3)
arXiv:cond-mat/0002468
Abstract
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.
4 pages, 3 figures, submitted to PRL