Effect of Local Structure Distortion on Superconductivity in Mg- and F-Codoped LaOBiS2

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• 作者：Haijie Chen ; Ganghua Zhang ; Tao Hu ; Gang Mu ; Wei Li ; Fuqiang Huang ; Xiaoming Xie ; Mianheng Jiang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：January 6, 2014
• 年：2014
• 卷：53
• 期：1
• 页码：9-11
• 全文大小：279K
• ISSN：1520-510X

文摘

La_1鈥?i>xMg_xO_1鈥?xF_2xBiS₂ (x = 0.1鈥?.35) were synthesized, and their superconductive properties were investigated. The superconducting transition temperature (T_c) increased below the codoping level (x 鈮?0.25). La_1鈥?i>xMg_xOBiS₂ (x = 0鈥?.2) and La_1鈥?i>xMg_xO_0.6F_0.4BiS₂ (x = 0.1鈥?.3) were further prepared to explore the effect of Mg²⁺. We found that the introduction of Mg²⁺ and F^{鈥?/sup> leads to local structure distortion. Larger distortion is beneficial for superconductivity in LaOBiS₂, which was further confirmed by the results in La_1鈥?i>xCa_xO_1鈥?xF_2xBiS₂ (x = 0.2, 0.3).}