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Spin-polaron formation and phase separation

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Abstract

We study the formation of spin-polarized states within the three-bandtJ-model which corresponds to the largeU-limit of the Emery model. It turns out that in the three-band model these states are already stabilized in the relevant parameter regime whereas in the one-bandtJ-model spin-polarized states are only formed for unphysically small values ofJ/t. Following the concept of microscopic percolative phase separation we further study the properties of inhomogeneous spin-polarized substructures upon doping. As a simplest model the dopingdependent polarization of a stripe in the (11)-direction is investigated. To treat the distribution of cluster states more generally the CPA method is used. The results allow a description of the insulator-metal transition as an overlap of spin-polaronic wave functions forming thus a connected network of cluster states.

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Authors and Affiliations

  1. Institut für Physik, Technische Universität Cottbus, P.O. Box 101344, D-03044, Cottbus, Germany

    G. Seibold & E. Sigmund

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  1. G. Seibold
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  2. E. Sigmund
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  3. V. Hizhnyakov
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Seibold, G., Sigmund, E. & Hizhnyakov, V. Spin-polaron formation and phase separation. J Supercond 9, 407–412 (1996). https://doi.org/10.1007/BF00727287

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