SnAs with the NaCl-type Structure: Type-I Superconductivity and Single Valence State of Sn

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• 作者：Yue Wang ; Hikaru Sato ; Yoshitake Toda ; Shigenori Ueda ; Hidenori Hiramatsu ; Hideo Hosono
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：December 23, 2014
• 年：2014
• 卷：26
• 期：24
• 页码：7209-7213
• 全文大小：322K
• ISSN：1520-5002

文摘

We examined the superconductivity of SnAs and the valence state of Sn in its lattice with an expectation that SnAs and related compounds with the NaCl-type structure might exhibit superconductivity at a high critical temperature (T_c), as (Ba_1鈥?i>xK_x)BiO₃ (BKBO) does, owing to the similar crystallographic and chemical environments of Sn in SnAs and Bi in BKBO. Although SnAs had low T_c, 3.58 K, we clarified two important characteristics: First, SnAs exhibits weakly coupled type-I superconductivity. Second, Sn has a single valence state, like Sn³⁺(5s¹), originating from there being only one crystallographically independent site in its NaCl-type structure. This unconventional single chemical state of Sn in SnAs would explain the superconductivity of SnAs with a three-dimensional NaCl-type structure, rather than a two-dimensional layered structure.