Investigation of LiFeAs by means of "Break-junction" Techniqueстатья
Статья опубликована в журнале из списка RSCI Web of Science
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
Аннотация:(Статья подана в редакцию на английском языке.)
In our tunneling investigation using Andreev superconductor – normal metal – superconductor-contacts on LiFeAs single crystals we observed two reproducible independent subharmonic gap structures at dynamic conductance characteristics. From these results, we can derive the energy of the large superconducting gap Δ_Large = (2.5 ÷ 3.4) meV and the small gap Δ_Small = (0.9 ÷ 1) meV at T = 4.2 K for the Tc_local ≈ (10.5 ÷ 14) K (the contact area critical temperature which deviation causes the variation of Δ_Large). The BCS-ratio is found to be 2Δ_Large/kTc = (4.6 ÷ 5.6), whereas 2Δ_Small/kTc << 3.52 results from induced super¬conductivity in the bands with the small gap.