Low temperature transport properties of the BiCuSeO system

Authors

  • David Berardan,

    Corresponding author
    1. Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, UMR 8182, 91405 Orsay, France
    2. CNRS, 91405 Orsay, France
    • Phone: +33 1 69 15 31 90, Fax: +33 1 69 15 48 19
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  • Li-Dong Zhao,

    1. Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, UMR 8182, 91405 Orsay, France
    2. CNRS, 91405 Orsay, France
    3. Present address: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
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  • Celine Barreteau,

    1. Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, UMR 8182, 91405 Orsay, France
    2. CNRS, 91405 Orsay, France
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  • Nita Dragoe

    1. Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, UMR 8182, 91405 Orsay, France
    2. CNRS, 91405 Orsay, France
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Abstract

The discovery of a 26 K superconductivity in the tetragonal iron-based pnictide LaFeAsO1 − xFx (x = 0.05–0.12) has stimulated a tremendous search for superconductivity in a wide class of materials with similar structure. Beside superconductivity, promising thermoelectric properties have been discovered in this family in the cryogenic temperature range and in the p-type BiCuSeO system around 400–600 °C. In this paper, we report on the effect of various substitutions on the low temperature properties of this system. Whatever the substitution, all samples revealed p-type, and no superconductivity was observed. Moreover, although some of these compounds exhibit very promising thermoelectric properties above room temperature, this is not the case in the low temperature range.

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