Abstract
We report X-ray diffraction, magnetization and transport measurements for polycrystalline samples of the new layered superconductor Bi4−x Ag x O4S3 (0 ≤ x ≤ 0.2). The superconducting transition temperature (T C) decreases gradually and finally suppressed when x < 0.10. Accordingly, the resistivity changes from a metallic behavior for x < 0.1 to a semiconductor-like behavior for x > 0.1. The analysis of Seebeck coefficient shows there are two types of electron-like carriers dominate at different temperature regions, indicative of a multiband effect responsible for the transport properties. The suppression of superconductivity and the increased resistivity can be attributed to a shift of the Fermi level to the lower-energy side upon doping, which reduces the density of states at E F. Further, our result indicates the superconductivity in Bi4O4S3 is intrinsic and the dopant Ag prefers to enter the BiS2 layers, which may essentially modify the electronic structure.
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Tan, S.G., Tong, P., Liu, Y. et al. Suppression of superconductivity in layered Bi4O4S3 by Ag doping. Eur. Phys. J. B 85, 414 (2012). https://doi.org/10.1140/epjb/e2012-30975-2
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DOI: https://doi.org/10.1140/epjb/e2012-30975-2