Low-temperature microstructural studies on superconducting CaFe 2 As 2

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

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號6393
期刊Scientific reports
9
發行號1
DOIs
出版狀態Published - 2019 12月 1

All Science Journal Classification (ASJC) codes

  • 多學科

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