Direct Evidence of Two Superconducting Gaps in FeSe(0.5)Te(0.5): SnS-Andreev Spectroscopy and Lower Critical Fieldстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 25 апреля 2017 г.
Аннотация:We present direct measurements of the superconducting order parameter in nearly optimal Fe(Se0.5Te0.5) single crystals with critical temperature Tc ≈ 14 K. Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy and measurements of lower critical field, we directly determined two superconducting gaps, Δ_L ≈ 3.3-3.4 meV and Δ_S ≈ 1 meV, and their temperature dependences. We show that a two-band model fits well the experimental data. The estimated electron-boson coupling constants indicate a strong intraband and a moderate interband interaction.