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National Academy of Sciences, Proceedings of the National Academy of Sciences, 45(116), p. 22458-22463, 2019

DOI: 10.1073/pnas.1912610116

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Evolution of superconductivity in K <sub>2−x</sub> Fe <sub>4+y</sub> Se <sub>5</sub> : Spectroscopic studies of X-ray absorption and emission

Journal article published in 2019 by H. T. Wang ORCID, Anirudha Ghosh, C. H. Wang, S. H. Hsieh, Y. C. Shao, J. W. Chiou, C. L. Chen, C. W. Pao, J. F. Lee, Y. S. Liu, Y. D. Chuang, J. H. Guo ORCID, M. K. Wu, W. F. Pong
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Significance We report the study using X-ray absorption and resonant inelastic X-ray scattering techniques to investigate the evolution of superconductivity in K 1.9 Fe 4.2 Se 5 , which was synthesized from its nonsuperconducting parent compound, K 2 Fe 4 Se 5 , by increasing the Fe concentration. The results provide a deeper insight into the magnetic and local electronic properties of K 1.9 Fe 4.2 Se 5 , such as a decrease in antiferromagnetic spin magnetic moment of Fe, charge transfer, and hybridization between Fe 3 d –Se 4 p orbitals, and increase in the local static structural disorder, to gain an understanding of the evolution of superconductivity in the compound.