Superconductivity at 28.3 and 17.1 K in (Ca4Al2O6-y)(Fe2Pn2) (Pn=As and P)
Abstract
Here we report on discovery of (Ca4Al2O6-y)(Fe2Pn2) (Pn =As and P) [Al-42622(Pn)] superconductor using high-pressure synthesis technique. Al-42622(Pn) exhibit superconductivity for both Pn =As and P with the transition temperatures of 28.3 K and 17.1 K, respectively. The a-lattice parameters of Al-42622(Pn) (a =3.713 Å and 3.692 Å for Pn =As and P, respectively) are smallest among the iron-pnictide superconductors. Correspondingly, Al-42622(As) has the smallest As-Fe-As bond angle (102.1°) and the largest As distance from the Fe planes (1.500 Å).
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2010
- DOI:
- arXiv:
- arXiv:1008.2586
- Bibcode:
- 2010ApPhL..97q2506S
- Keywords:
-
- bond angles;
- calcium compounds;
- iron compounds;
- lattice constants;
- superconducting materials;
- superconducting transition temperature;
- 74.62.Fj;
- 74.62.Bf;
- 61.66.Fn;
- 74.70.Xa;
- 74.62.-c;
- Pressure effects;
- Effects of material synthesis crystal structure and chemical composition;
- Inorganic compounds;
- Transition temperature variations;
- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science
- E-Print:
- 12 pages, 3 Figures