Incorporation of sulfur ions into La2-xSrxCuO4 superconducting cuprate
Incorporation of sulfur ions into La2-xSrxCuO4 superconducting cuprate
复制标题
La2-xSrxCuO4超导铜酸盐中硫离子的掺入
DOI：
10.1080/21870764.2018.1507611
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发表时间：
2018
影响因子：
2.3
通讯作者：
Oh-ishi Katsuyoshi
中科院分区：
文献类型：
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作者：
Oka Kengo;Shirota Kensuke;Sato Yoshiki;Oh-ishi Katsuyoshi
la2cuo4基材料的超导性可以通过在Cu离子中掺杂空穴来实现。在这项研究中，通过将阴离子位点与氧和硫混合来调节空穴含量。用硫取代la1.7 sr0.3 cuo4导致过掺杂区域的超导性恢复，结果表明空穴含量减少。精确的结构分析表明，大部分硫在srso4相的杂质中被吸收，通过降低Sr含量降低了Cu离子的空穴含量；然而，超导性不能仅用这一机制来解释。通过对晶格参数和x射线光电子能谱的研究，获得了la1.7 sr0.3 cuo4sxx相中存在硫的支持证据。用硫取代氧可以减少空穴的含量，这是一种恢复超导性的方法。
The superconductivity of La2CuO4-based materials is known to be achievable by doping holes in Cu ions. In this study, the hole content was tuned by mixing anion sites with oxygen and sulfur. The substitution of La1.7Sr0.3CuO4with sulfur led to the recovery of superconductivity from overdoped regions, a result indicative of decreased hole content. Precise structural analysis revealed that the majority of sulfur is incorporated into impurities in the SrSO4phase, which decreases the hole content of Cu ions via a decrease in the Sr content; however, the superconductivity cannot be interpreted by this mechanism alone. Supporting evidence for the incorporation of sulfur into the La1.7Sr0.3CuO4Sxphase was obtained by an investigation of the composition dependence of the lattice parameters and X-ray photoelectron spectroscopy. Substitution of oxygen with sulfur, which served to decrease the hole content, as a means of recovering superconductivity was shown to act.