Distorted FeSe4 Unit in Ammonium ion Intercalated FeSe Superconductor

Publication date: Available online 9 November 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Wenwu Zhong, Shijie Shen, Shangshen Feng, Yanping Liu, Aijiao Xu, Xiufang Ye, Dongchu ChenAbstractWe demonstrate that unique cation, ND4(1-δ)+, exists between FeSe layers and induces a large distortion of the FeSe4 tetrahedron in N0.81(1)D3.24(2)Fe2Se2 by neutron and X-ray powder diffraction. The electronic correlations of the Fe 3d electrons and Fe dxy, dyz and dxz band widths could be tuned by changing the FeSe4 tetrahedron distortion, revealing the importance of lattice distortion to the superconductivity of FeSe-based intercalates.Graphical abstract

Source: Inorganic Chemistry Communications - November 10, 2019 Category: Chemistry Source Type: research