Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface

• Hiroki Izawa

• Yuji Tanaka

• Yoshikazu Mizuguchi

• Osuke Miura

抄録

We investigated the magnetization and crystal structure of FeSe polycrystalline samples with various grain sizes. For the samples with large grains, a large magnetic critical current density J c was observed. For the samples with small grains, superconductivity signals were not observed; instead, magnetization hysteresis, which is not a result of superconductivity, was observed. In the X-ray diffraction pattern for the samples with small grains, broad additional peaks were observed, corresponding to the formation of the non-superconducting (monoclinic) Fe–Se phase at the FeSe grain surface. The crystal structure instability at the grain surface would be the reason for the low superconducting properties of the Fe-chalcogenide polycrystalline wires investigated thus far.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 55 (5), 053101-, 2016-04-01

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360003449890496640
• NII論文ID: 210000146460
• DOI: 10.7567/jjap.55.053101
• ISSN: 13474065
• ISSN: 00214922
• Web Site: http://stacks.iop.org/1347-4065/55/i=5/a=053101/pdf
• Web Site: http://stacks.iop.org/1347-4065/55/i=5/a=053101?key=crossref.a6f518813b43037560151375d0fba252
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.053101
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.053101/pdf
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