Superconducting property and Fe valence state of FeSe thick films grown from high temperature solution

Xiaoding Qi, Jiun Yi Wang, Jui Chao Kuo, Karen A. Yates, Lesley F. Cohen

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Thick FeSe films (1-2 μm) were grown from high temperature solution with SeSn as the flux. Electron backscatter diffraction confirmed the films of tetragonal β phase with high crystallinity. Superconducting transition was observed by magnetic measurements, with the onset Tc of 6.1 K for the as-grown films and rising to 6.9 K after post-growth annealing at 400 °C, which was still 1.5 K lower than the sintered powder samples. X-ray photoelectron spectroscopy showed that the Fe 2p3/2 binding energy in the FeSe compound was composed of two peaks at 707.8 eV and 706.6 eV, respectively. The former was close to the value of Fe in polarized ionic bonds, while the later had the typical value in metallic bondings. The ratio of the two bondings was 1.56 and 1.94 for the films and sintered powders, respectively. The critical temperature may have some correlation with the ratio of the two bondings. A lower average Fe valence was probably the cause for the lower T c observed in thick films.

原文English
頁(從 - 到)6350-6353
頁數4
期刊Journal of Alloys and Compounds
509
發行號22
DOIs
出版狀態Published - 2011 六月 2

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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