Abstract
Superconductivity with layered structure has attracted intensive research interests due to their exotic superconducting properties. In 2012, a new family of BiS2-based superconductor with their desired layered structure has been discovered. Recently, the isostructural superconductor with the substitution of Se for all S ions in BiS2-based compounds is recognized as the BiSe2-based superconductors. To date, enormous efforts were dedicated to explore the physical properties of this new family. Among them, synchrotron radiation-based X-ray absorption spectroscopy (XAS) contributed significantly to the understanding of local atomic structure and the electronic structure of BiS2/BiSe2-based systems. This article reviewed the progresses in the study of the new BiS2/BiSe2-based materials revealed by the unique technique XAS, including the determination of valence state, local atomic displacements, as well as the different structural distortion between BiS2-based and BiSe2-based systems. The superconductivity of BiS2- and BiSe2-based system is indeed intimately related to valence states and local atomic displacements. Further development of microscopic mechanism of superconductivity in BiS2/BiSe2-based materials requires synergetic endeavors integrating new experimental, numerical, and theoretical techniques.
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Acknowledgements
This work was supported in part by the Natural Science Foundation of Jiangsu Province of China (BK20171440), Jiangsu Natural Science Foundation for Excellent Young Scholar (BK20170101), Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJKY19_0779), and the Foundation of Nan**g University of Posts and Telecommunications (NY218039).
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Dong, P., Cheng, J., Wang, X. et al. An Overview on the Local Atomic Displacements and Electronic Structures in BiS2/BiSe2-Based Superconductors. J Supercond Nov Magn 32, 1517–1527 (2019). https://doi.org/10.1007/s10948-019-5110-8
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DOI: https://doi.org/10.1007/s10948-019-5110-8