Short-range polaron correlations in the ferromagnetic La(1-x)Ca(x)MnO(3)

E. W. Plummer(Oak Ridge National Laboratory; J. A. Fernandez-Baca (Oak Ridge National Laboratory); Japan); Knoxville); N. Wakabayashi (Keio University; Pengcheng Dai; University of Tennessee; Y. Tokura (Joint Research Center for Atom Technology (JRCAT); Y. Tomioka

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Short-range polaron correlations in the ferromagnetic La(1-x)Ca(x)MnO(3)

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arxiv cond-mat/0008303 v1 submitted 2000-08-21 cond-mat.str-el

Pengcheng Dai , J. A. Fernandez-Baca (Oak Ridge National Laboratory) , N. Wakabayashi (Keio University , Japan) , E. W. Plummer(Oak Ridge National Laboratory , University of Tennessee , Knoxville) , Y. Tomioka

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Y. Tokura (Joint Research Center for Atom Technology (JRCAT)

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classification cond-mat.str-el

keywords correlationsdopingpolaronpolaronsshort-rangecoherencecommensurationcorrelated

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abstract

We use neutron scattering to demonstrate the presence of lattice polarons and their short-range correlations for several samples of La$_{1-x}$Ca$_x$MnO$_3$ in the Ca doping range $0.15\leq x\leq 0.3$. We establish the doping dependence of the orientation, commensuration, and coherence length of the polaron correlations and show that the populations of correlated and uncorrelated polarons are intimately related to the transport properties of the materials.

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