Field-Induced Crossover and Colossal Magnetoresistance in La(0.7)Pb(0.3)MnO(3)

Y. Y. Xue (1) , B. Lorenz (1) , A. K. Heilman (1) , M. Gospodinov (2) , S. G. Dobreva (2) , C. W. Chu (1 , 3) ((1) Texas Center for Superconductivity , University of Houston

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Houston TX (2) Bulgarian Academy of Sciences Sofia Bulgaria (3) Lawrence Berkeley National Laboratory Berkeley CA)

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classification ❄️ cond-mat.str-el

keywords crossoverfield-inducedmagnetoresistanceresistivitysmallspin-cantedaccompaniedaround

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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.

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Field-Induced Crossover and Colossal Magnetoresistance in La(0.7)Pb(0.3)MnO(3)

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