Disappearance of Superconductivity in the Solid Solution between (Ca4Al2O6)(Fe2As2) and (Ca4Al2O6)(Fe2P2) Superconductors
2012
Shirage, Parasharam M. | Kihou, Kunihiro | Yi, Chʻŏr-ho | Takeshita, Nao | Eisaki, Hiroshi | Iyo, Akira
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 Tc’s of 28 and 17 K, respectively, their solid solutions of the form (Ca₄Al₂O₆)(Fe₂(As₁–ₓPₓ)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 “parent” compounds. Notably, the solid solutions in the non-superconducting range exhibit resistivity anomalies at temperatures of 50–100 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.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library