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Resistivity of positive-J spin glasses: Study ofLaGd under hydrostatic pressure

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Zeitschrift für Physik B Condensed Matter

Abstract

Results of a new calculation of the resistivity in the noise model of spin glasses, based on the −J σ⋅S interaction forpositive J, are compared with measurements of the resistivity in an fcc La-8at% Gd alloy under hydrostatic pressures up to 12 kbar, the first positive-J resistivity investigations under pressure. A positive value ofJ that decreases with increasing pressure, in accord with other experiments, leads to quantitative agreement between theory and experiment if one uses a large electronic density of states at the Fermi energy, in accord with specific heat measurements and electronic band structure calculations in fcc La. Impurity potential scattering is found to contribute significantly to the resistivity. Its size and pressure variation is determined.

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Authors and Affiliations

  1. Physics Laboratory I, H.C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark

    Ulf Larsen

  2. Institut für Experimentalphysik IV, Universität Bochum, Universitätsstraße 150 Gebäude NB 4/130, Postfach 102148, D-4630, Bochum, Germany

    H. Peukert & J. S. Schilling

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  1. Ulf Larsen
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  2. H. Peukert
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  3. J. S. Schilling
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This work is supported in part by the Deutsche Forschungs-gemeinschaft.

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Larsen, U., Peukert, H. & Schilling, J.S. Resistivity of positive-J spin glasses: Study ofLaGd under hydrostatic pressure. Z Physik B 37, 115–121 (1980). https://doi.org/10.1007/BF01365367

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  • DOI: https://doi.org/10.1007/BF01365367

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