Superconductivity and Magnetism in BiOCuS

Details Superconductivity and Magnetism in BiOCuS Superconductivity and Magnetism in BiOCuS

2010-01-13

arxiv.org/abs/1001.2332v2

Phys. Rev. B 81, 140508(R) (2010)

Physics

Condensed Matter

Superconductivity

Final version accepted for publication

Scientific paper

BiOCu_{1-y}S was recently reported to superconduct at T=5.8 K at y~0.15. Band structure calculations indicate that stoichiometric BiOCuS is a band insulator. In this paper, I show that hole-doped (whether in the virtual crystal approximation or with actual Cu vacancies) BiOCuS is on the verge of a ferromagnetic instability (cf. Pd metal), and therefore conventional superconductivity with Tc~6 K is quite unlikely. Presumably, hole-doped BiOCuS is another example of superconductivity mediated by spin-fluctuations

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