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arXiv · 1412.3070

Superconductivity in Semimetallic Bi3O2S3

L. Li·D. Parker·P. Babkevich·L. Yang·H. M. Ronnow·A. S. Sefat
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Abstract

Here we report further investigation on the thermodynamic, and transport properties, and the first assessment of theoretical calculations for the BiS2-layered Bi3O2S3 superconductor. The polycrystalline sample is synthesized with the superconducting transition temperature of Tc_onset = 5.75 K, that drops to 3.3 K by applying hydrostatic pressure of 6 kbar. Density-of-states calculations give substantial hybridization between Bi, O and S, with the largest Bi component at DOS, which supports the idea that BiS2 layer is relevant for producing electron-phonon coupling. The electron charge carrier concentration of only 1.5 x 10^19 cm-3 for Bi3O2S3 is additionally suggestive of strong electron-phonon interaction in Bi-O-S system. The analysis of Seebeck coefficient results strongly suggests that Bi3O2S3 is a semimetal. In fact, the semimetallic or narrow band gap behavior may be general in the BiS2-layered class of materials, including that of Bi4O4S3.

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L. Li, D. Parker, P. Babkevich, L. Yang, H. M. Ronnow, A. S. Sefat. 2014-12-09. Superconductivity in Semimetallic Bi3O2S3. https://doi.org/10.1103/physrevb.91.104511

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