New Kagome Metal Sc3Mn3Al7Si5 and Its Gallium-Doped Analogues: Synthesis, Crystal Structure, and Physical Properties

详细信息    查看全文

• 作者：Hua He ; Wojciech Miiller ; Meigan C. Aronson
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：September 2, 2014
• 年：2014
• 卷：53
• 期：17
• 页码：9115-9121
• 全文大小：355K
• ISSN：1520-510X

文摘

We report the synthesis, crystal structure, and basic properties of the new intermetallic compound Sc₃Mn₃Al₇Si₅. The structure of the compound was established by single-crystal X-ray diffraction, and it crystallizes with a hexagonal structure (Sc₃Ni₁₁Si₄ type) with Mn atoms forming the Kagome nets. The dc magnetic susceptibility measurements reveal a Curie鈥揥eiss moment of 鈭?.51 渭_B/Mn; however, no magnetic order is found for temperatures as low as 1.8 K. Electrical resistivity and heat capacity measurements show that this compound is definitively metallic, with a relatively large specific heat Sommerfeld coefficient, indicating strong electronic correlations. Intriguingly, these features have revealed Sc₃Mn₃Al₇Si₅ as a possible quantum spin liquid. With chemical and lattice disorder introduced by doping, a spin liquid to spin glass transition is observed in the highest Ga-doped compounds. The roles of the geometrically frustrated structure and Mn-ligand hybridization in the magnetism of the title compounds are also discussed.