Evolution of superconductivity in K2−xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission

doi:10.1073/pnas.1912610116

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/118907

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題名:	Evolution of superconductivity in K2−xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission
作者:	Wang, H T;Ghosh, Anirudha;Wang, C H;Hsieh, S H;Shao, Y C;Chiou, J W;Chen, C L;Pao, C W;Lee, J F;Liu, Y S;Chuang, Y D;Guo, J H;Wu, M K;Pong, W F
關鍵詞:	Fe vacancy disorder;X-ray absorption spectroscopy;resonant inelastic X-ray scattering;superconductivity
日期:	2019-11-05
上傳時間:	2020-07-14 12:10:20 (UTC+8)
摘要:	This study investigates the evolution of superconductivity in K2-xFe4+ySe5 using temperature-dependent X-ray absorption and resonant inelastic X-ray scattering techniques. Magnetization measurements show that polycrystalline superconducting (SC) K1.9Fe4.2Se5 has a critical temperature (T c) of ∼31 K with a varying superconducting volume fraction, which strongly depends on its synthesis temperature. An increase in Fe-structural/vacancy disorder in SC samples with more Fe atoms occupying vacant 4d sites is found to be closely related to the decrease in the spin magnetic moment of Fe. Moreover, the nearest-neighbor Fe-Se bond length in SC samples exceeds that in the non-SC (NS) sample, K2Fe4Se5, which indicates a weaker hybridization between the Fe 3d and Se 4p states in SC samples. These results clearly demonstrate the correlations among the local electronic and atomic structures and the magnetic properties of K2-xFe4+ySe5 superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.
關聯:	Proceedings of the National Academy of Sciences of the United States of America 116(45), p.22458-22463
DOI:	10.1073/pnas.1912610116
顯示於類別:	[物理學系暨研究所] 期刊論文

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