AI Article Synopsis
- Researchers have identified a new layered structure called [(Fe,Al)(OH)][FeSe] using hydrothermal ion-exchange techniques, comprising alternating tetragonal FeSe and hexagonal (Fe,Al)(OH) layers.
- The initially nonsuperconducting structure contains Fe vacancies in the FeSe layer, but achieves superconductivity at 40 K after a lithiation process that removes these vacancies.
- This discovery suggests strong potential for superconductivity in iron-based materials, paving the way for further explorations in this area of condensed matter physics.
Article 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)][FeSe], 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)][FeSe] is composed of the alternating stacking of a tetragonal FeSe layer and a hexagonal (Fe,Al)(OH) layer. In [(Fe,Al)(OH)][FeSe], there exists a mismatch between the FeSe sublayer and the (Fe,Al)(OH) sublayer, and the lattice of the layered heterostructure is quasi-commensurate. The as-synthesized [(Fe,Al)(OH)][FeSe] is nonsuperconducting due to the Fe vacancies in the FeSe layer. The superconductivity with a of 40 K can be achieved after a lithiation process, which is due to the elimination of the Fe vacancies in the FeSe layer. The is nearly the same as that of (Li,Fe)OHFeSe although the structure of [(Fe,Al)(OH)][FeSe] is quite different from that of (Li,Fe)OHFeSe. The new layered heterostructure of [(Fe,Al)(OH)][FeSe] contains 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.
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| http://dx.doi.org/10.1021/acs.inorgchem.0c03686 | DOI Listing |
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