Journal
CRYSTENGCOMM
Volume 15, Issue 10, Pages 1989-1993Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce26857d
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Funding
- Russian Federation for State Support of Young Russian Scientists [MK-1557.2011.5]
- Russian Foundation for Basic Research [12-02-90405, 12-02-90823]
- Russian Ministry of Science and Education [11.519.11.6012, 8378]
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The plate-like single crystals of tetragonal (P4/nmm) FeSe1-x superconductors were grown using the KCl-AlCl3 flux technique which produced single crystalline tetragonal samples of about 4 x 4 x 0.1 mm(3) dimensions. The energy dispersive X-ray spectroscopy established a ratio of Fe : Se = 1 : 0.96 +/- 0.02. The resistivity and magnetization measurements revealed a sharp superconducting transition at T-c = 9.4 K. Multiple Andreev reflections spectroscopy pointed to the existence of two-gap superconductivity with the gap values Delta(L) = 2.4 +/- 0.2 meV and Delta(S) = 0.75 +/- 0.1 meV at 4.2 K.
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