Abstract
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.
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