Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 30, Issue 11, Pages 3117-3122Publisher
SPRINGER
DOI: 10.1007/s10948-017-4117-2
Keywords
Ag-added FeSe; Raman spectroscopy; Atomic force microscopy; Critical current density (J(c))
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Funding
- Japan Student Services Organization (JASSO)
- Shibaura Institute of Technology (SIT), under the Top Global University Project
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We have synthesized polycrystalline bulk FeSe materials with various Ag concentrations through double-sintering solid-state reaction. All the samples exhibited similar onset critical temperature of around 8 K. Atomic force microscopic observation revealed that the grain connectivity was improved through Ag addition. Raman spectroscopic studies confirmed that pristine and Ag-doped FeSe compounds have superconducting tetragonal structure with high crystalline quality. There was a clear red shift and peak broadening in Fe-related Raman modes when the Ag concentration is increased, which might be ascribed to the incorporation of Ag+ ions into the FeSe lattice. The critical current density decreased with Ag addition, although onset critical temperature remained constant.
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