کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1818067 | 1525728 | 2013 | 4 صفحه PDF | دانلود رایگان |
Here we report on the discovery of the perovskite type blocking layered, Ca4Al2O6−yFe2As2 (Al-42622(Pn)) and Ca3Al2O5−yFe2As2 (Al-32522(Pn)) (where Pn = As, P), iron based superconductors. These new materials are synthesized by using high-pressure synthesis method. Al-42622 shows a superconducting critical temperatures Tc at 28.3 K for Pn = As and 17.1 K for Pn = P. Al-32522(Pn) shows a Tc at 30.2 K for Pn = As and 16.6 K for Pn = P. Al-42622(Pn) contains smallest a-axis lattice parameters among the iron-pnictide superconductors while Al-32522(Pn) is the first superconductor in the “32522” type crystal structure. More details on synthesis and characterization of these materials will be given in this paper.
► Perovskite type blocking layered high-Tc superconductors discovery.
► High pressure synthesis technique.
► Ca3Al2O5Fe2Pn2 (Pn = As, P) is first superconductor with “32522” structure.
► “Al-42622” has smallest a-axis lattice constant and As–Fe–As bond angle.
► Important materials for future developments.
Journal: Physica C: Superconductivity - Volume 484, 15 January 2013, Pages 12–15