Transport properties and spin correlations of La1.85-xSr0.15+xCu1-xFexO4

G.J. Xu, Q.R. Pu, B. Liu, R.H. Tao, G.S. Wang, Z.J. Ding, Jean-Claude Grivel, N.H. Andersen

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    A series of double-doped La1.85-xSr0.15+xCu1-xFexO4 (0less than or equal toxless than or equal to1) ceramic samples were prepared by the solid-state reaction method. The structure, transport properties, and spin correlations were studied by means of x-ray diffraction, resistivity, thermoelectric power (TEP) and electron spin resonance (ESR). Double doping causes an increase of the lattice parameter a and a decrease of c. A great discrepancy of the thermal activation energy is derived from the resistivity and TEP at high doping levels, which can be understood in terms of a polaron model. The ESR result indicates that the double doping influences the spin correlation of the CuO2 plane markedly, which suggests that the Fe3+ spins change from localization to delocalization as x increases from low doping to high doping. A close relation between localized spin scattering and the broad peak in the TEP versus T curve is proposed. A comparison of the transport mechanism between the Fe doped and the Co and Ni doped La214 systems is given in this paper.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Issue number10
    Pages (from-to)104506
    Number of pages6
    Publication statusPublished - 2004

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