Strong Localization of Anionic Electrons at Interlayer for Electrical and Magnetic Anisotropy in Two-Dimensional Y2C Electride

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• 作者：Jongho Park ; Kimoon Lee ; Seung Yong Lee ; Chandani N. Nandadasa ; Sungho Kim ; Kyu Hyoung Lee ; Young Hee Lee ; Hideo Hosono ; Seong-Gon Kim ; Sung Wng Kim
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：139
• 期：2
• 页码：615-618
• 全文大小：355K
• ISSN：1520-5126

文摘

We have synthesized a single crystalline Y₂C electride of centimeter-scale by floating-zone method and successfully characterized its anisotropic electrical and magnetic properties. In-plane resistivity upturn at low temperature together with anisotropic behavior of negative magnetoresistance is ascribed to the stronger suppression of spin fluctuation along in-plane than that along the c-axis, verifying the existence of magnetic moments preferred for the c-axis. A superior magnetic moment along the c-axis to that along the in-plane direction strongly demonstrates the anisotropic magnetism of Y₂C electride containing a magnetically easy axis. It is clarified from the theoretical calculations that the anisotropic nature of the Y₂C electride originates from strongly localized anionic electrons with an inherent magnetic anisotropy in the interlayer spaces.