Microstructure of quasi-one-dimensional superconductor KCr3As3 prepared by K-ion deintercalation
- 15 February 2021
- journal article
- research article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 33 (21), 215404
- https://doi.org/10.1088/1361-648x/abe64d
Abstract
The microstructure of quasi-one-dimensional KCr3As3 (133) superconductors, which were prepared by chemical cation deintercalation from their counterpart K2Cr3As3 (233) compounds, are investigated using scanning transmission electron microscopy. The nominal KCr3As3 crystals generally exhibit irregular nanoscale 133-phase domains accompanied by an amorphous As-deficient phase and cracks as a result of alkali cation deintercalation processes. Analysis of local defective structures reveals the existence of an intermediate state in the transformation from 233 to 133 phase and a possible K-deficient 233-type structure as a nanoscale cluster. Our microscopic investigations offer insight into the microstructure of KCr3As3 and the alkali metal cation deintercalation processes.Keywords
Funding Information
- Scientific Instrument Developing Project of the Chinese Academy of Sciences (YJKYYQ20200055)
- National Key Research and Development Program of China (2016YFA0300303 2017YFA0302904 2017YFA0303000 2017YFA0504703)
- National Natural Science Foundation of China (11774391 11774403 11804381 11974019 12074408)
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB07020000 XDB25000000 XDB33010100)
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