Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
| Autor: | Izawa, Hiroki, Tanaka, Yuji, Mizuguchi, Yoshikazu, Miura, Osuke |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Jpn. J. Appl. Phys. 55, 053101 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7567/JJAP.55.053101 |
| Popis: | 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 Jc 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. Comment: 16 pages, 4 figures, 3 supplemental materials |
| Databáze: | arXiv |
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