Low-temperature microstructural studies on superconducting CaFe2As2

Huyan, S.; Deng, L. Z.; Wu, Z.; Zhao, K.; Sun, J. Y.; Wu, L. J.; Zhao, Y. Y.; Yuan, H. M.; Gooch, M.; Lv, B.; Zhu, Y.; Chen, S.; Chu, C. W.

doi:10.1038/s41598-019-42660-6

Title: Low-temperature microstructural studies on superconducting CaFe2As2

Journal Article · 22 April 2019 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-019-42660-6 · OSTI ID:1619509

Huyan, S.;

; Wu, Z.; Zhao, K.; Sun, J. Y.;

; Zhao, Y. Y.; Yuan, H. M.; Gooch, M.;

; Zhu, Y.; Chen, S.; Chu, C. W.

Abstract Undoped CaFe ₂ As ₂ (Ca122) can be stabilized in two slightly different non-superconducting tetragonal phases, PI and PII, through thermal treatments. Upon proper annealing, superconductivity with a T _c up to 25 K emerges in the samples with an admixture of PI and PII phases. Systematic low-temperature X-ray diffraction studies were conducted on undoped Ca122 samples annealed at 350 °C over different time periods. In addition to the diffraction peaks associated with the single-phase aggregation of PI and PII, a broad intermediate peak that shifts with annealing time was observed in the superconducting samples only. Our simulation of phase distribution suggests that the extra peak is associated with the admixture of PI and PII on the nanometer scale. High-resolution transmission electron microscopy confirms the existence of these nano-scale phase admixtures in the superconducting samples. These experimental results and simulation analyses lend further support for our conclusion that interfacial inducement is the most reasonable explanation for the emergence of superconductivity in undoped Ca122 single crystals.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: U.S. Air Force Office of Scientific Research; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; SC0012704

OSTI ID:: 1619509

Report Number(s):: BNL--212039-2019-JAAM; 6393; PII: 42660

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 9; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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