Department of Energy Science, Sungkyunkwan University (SKKU) , Suwon 16419, Republic of Korea.
Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
J Am Chem Soc. 2017 Jan 18;139(2):615-618. doi: 10.1021/jacs.6b11950. Epub 2017 Jan 5.
We have synthesized a single crystalline YC 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 YC electride containing a magnetically easy axis. It is clarified from the theoretical calculations that the anisotropic nature of the YC electride originates from strongly localized anionic electrons with an inherent magnetic anisotropy in the interlayer spaces.
我们通过浮区法合成了厘米级的单晶 YC 富勒烯，并成功地对其各向异性的电学和磁学性质进行了表征。低温下的面内电阻率上升以及各向异性的负磁阻行为归因于沿面内方向比沿 c 轴方向更强烈地抑制自旋涨落，证实了存在沿 c 轴取向的磁矩。沿 c 轴方向的磁矩明显大于沿面内方向的磁矩，强烈证明了含有易磁化轴的 YC 富勒烯的各向异性磁体性质。理论计算表明，YC 富勒烯的各向异性性质源于层间空间中具有固有磁各向异性的强烈局域阴离子电子。
