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Superconductivity at 40 K in Lithiation-Processed [(Fe,Al)(OH)2][FeSe]1.2with a Layered Structure
- Source :
- Inorganic Chemistry; March 2021, Vol. 60 Issue: 6 p3902-3908, 7p
- Publication Year :
- 2021
-
Abstract
- Exploration of new superconductors has always been one of the research directions in condensed matter physics. We report here a new layered heterostructure of [(Fe,Al)(OH)2][FeSe]1.2, which is synthesized by the hydrothermal ion-exchange technique. The structure is suggested by a combination of X-ray powder diffraction and the electron diffraction (ED). [(Fe,Al)(OH)2][FeSe]1.2is composed of the alternating stacking of a tetragonal FeSe layer and a hexagonal (Fe,Al)(OH)2layer. In [(Fe,Al)(OH)2][FeSe]1.2, there exists a mismatch between the FeSe sublayer and the (Fe,Al)(OH)2sublayer, and the lattice of the layered heterostructure is quasi-commensurate. The as-synthesized [(Fe,Al)(OH)2][FeSe]1.2is nonsuperconducting due to the Fe vacancies in the FeSe layer. The superconductivity with a Tcof 40 K can be achieved after a lithiation process, which is due to the elimination of the Fe vacancies in the FeSe layer. The Tcis nearly the same as that of (Li,Fe)OHFeSe although the structure of [(Fe,Al)(OH)2][FeSe]1.2is quite different from that of (Li,Fe)OHFeSe. The new layered heterostructure of [(Fe,Al)(OH)2][FeSe]1.2contains an iron selenium tetragonal lattice interleaved with a hexagonal metal hydroxide lattice. These results indicate that the superconductivity is very robust for FeSe-based superconductors. It opens a path for exploring superconductivity in iron-base superconductors.
Details
- Language :
- English
- ISSN :
- 00201669 and 1520510X
- Volume :
- 60
- Issue :
- 6
- Database :
- Supplemental Index
- Journal :
- Inorganic Chemistry
- Publication Type :
- Periodical
- Accession number :
- ejs55646810
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.0c03686