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• 作者：Parasharam M. Shirage ; Kunihiro Kihou ; Chul-Ho Lee ; Nao Takeshita ; Hiroshi Eisaki ; Akira Iyo
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：September 19, 2012
• 年：2012
• 卷：134
• 期：37
• 页码：15181-15184
• 全文大小：280K
• 年卷期：v.134,no.37(September 19, 2012)
• ISSN：1520-5126

文摘

The effect of alloying the two perovskite-type iron-based superconductors (Ca₄Al₂O₆)(Fe₂As₂) and (Ca₄Al₂O₆)(Fe₂P₂) was examined. While the two stoichiometric compounds possess relatively high T_c鈥檚 of 28 and 17 K, respectively, their solid solutions of the form (Ca₄Al₂O₆)(Fe₂(As_1鈥?i>xP_x)₂) do not show superconductivity over a wide range from x = 0.50 to 0.95. The resultant phase diagram is thus completely different from those of other typical iron-based superconductors such as BaFe₂(As,P)₂ and LaFe(As,P)O, in which superconductivity shows up when P is substituted for As in the non-superconducting 鈥減arent鈥?compounds. Notably, the solid solutions in the non-superconducting range exhibit resistivity anomalies at temperatures of 50鈥?00 K. The behavior is reminiscent of the resistivity kink commonly observed in various non-superconducting parent compounds that signals the onset of antiferromagnetic/orthorhombic long-range order. The similarity suggests that the suppression of the superconductivity in the present case also has a magnetic and/or structural origin.