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Ferromagnetism versus superconductivity in ramdom alloys

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Zeitschrift für Physik B Condensed Matter

Abstract

Magnetic, superconducting narrow-band alloys are studied within a random lattice model. Coulomb repulsion and contact-type attraction of the itinerant electrons, and the indirect exchange between local magnetic moments are taken into account. Averaging the free energy expansion in coherent potential approximation, the Ginzburg-Landau functional is derived with two biquadratically coupled order parameters. Coherent orderings and concentration-dependent critical temperatures are determined. The coefficients of theq 2-terms, i.e. the stiffness and diffusion constants, involve vertex corrections due to impurity scattering. The coexistence criterion resulting from the 4th-order couplings cannot be fulfilled, referring to a first order transition between ferromagnetism and superconductivity. Tetracritical behaviour is found by including the direct exchanges between the localized spins.

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Authors and Affiliations

  1. Sektion Physik, Karl-Marx-Universität Leipzig, Linnéstrasse, DDR-7010, Leipzig, German Democratic Republic

    E. Kolley & W. Kolley

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  1. E. Kolley
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  2. W. Kolley
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Kolley, E., Kolley, W. Ferromagnetism versus superconductivity in ramdom alloys. Z. Physik B - Condensed Matter 51, 29–35 (1983). https://doi.org/10.1007/BF01304041

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  • DOI: https://doi.org/10.1007/BF01304041

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