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arXiv · 0911.5305

BiOCuS: A new superconducting compound with oxypnictide - related structure

A. Ubaldini·E. Giannini·C. Senatore·D. van de Marel
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Abstract

The discovery of about 50 K superconductivity in the tetragonal Fe-based pnictides has stimulated the search for superconductivity in a wide class of materials with similar structure. Copper forms compounds isostructural to LaOFeAs. Single phase BiOCuS can be prepared by a solid state reaction at temperature lower than 500 C from a mixture of Bi2O3, Bi2S3 and Cu2S. The samples have been characterized by means of EDX analysis, X-ray diffraction, magnetic and electrical measurements. The cell parameters are a = 3.8708 A, c = 8.565 A. Charge carrier doping can be realized either by F substitutions for O, or by Cu off-stoichiometry. The latter doping route leads to the occurrence of superconductivity below Tc = 5.8 K.

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A. Ubaldini, E. Giannini, C. Senatore, D. van de Marel. 2009-11-27. BiOCuS: A new superconducting compound with oxypnictide - related structure. https://doi.org/10.1016/j.physc.2009.11.164

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