教師資料查詢 | 類別: 期刊論文 | 教師: 彭維鋒 Pong, Way-faung (瀏覽個人網頁)

標題:Evolution of superconductivity in K2−xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission
學年108
學期1
出版(發表)日期2019/11/05
作品名稱Evolution of superconductivity in K2−xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission
作品名稱(其他語言)
著者H T Wang; 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; M K Wu; W F Pong
單位
出版者
著錄名稱、卷期、頁數Proceedings of the National Academy of Sciences of the United States of America, Volume 116, Issue 45 , p.22458-22463
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.
關鍵字Fe vacancy disorder;X-ray absorption spectroscopy;resonant inelastic X-ray scattering;superconductivity
語言英文(美國)
ISSN1091-6490
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版
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