SnAs with the NaCl-type Structure: Type-I Superconductivity and Single Valence State of Sn
SnAs with the NaCl-type Structure: Type-I Superconductivity and Single Valence State of Sn
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DOI：
10.1021/cm503992d
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发表时间：
2014-12
影响因子：
8.6
通讯作者：
Yue Wang;Hikaru Sato;Y. Toda;S. Ueda;H. Hiramatsu;H. Hosono
中科院分区：
文献类型：
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作者：
Yue Wang;Hikaru Sato;Y. Toda;S. Ueda;H. Hiramatsu;H. Hosono
我们研究了SnAs的超导性和Sn在其晶格中的价态，并期望SnAs和具有nacl型结构的相关化合物可能在高临界温度（Tc）下表现出超导性，就像（Ba1-xKx）BiO3 （BKBO）一样，因为SnAs中的Sn和BKBO中的Bi具有相似的晶体学和化学环境。尽管SnAs具有低Tc (3.58 K)，但我们明确了两个重要特征：首先，SnAs具有弱耦合的i型超导性。其次，锡像Sn3+(5s1)一样具有单一价态，这是由于在其nacl型结构中只有一个晶体独立的位点。SnAs中Sn的这种非常规的单一化学状态可以解释SnAs具有三维nacl型结构而不是二维层状结构的超导性。
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 (Tc), as (Ba1–xKx)BiO3 (BKBO) does, owing to the similar crystallographic and chemical environments of Sn in SnAs and Bi in BKBO. Although SnAs had low Tc, 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.