Direct Evidence of Two Superconducting Gaps in FeSe$_{0.5}$Te$_{0.5}$: SnS-Andreev Spectroscopy and Lower Critical Field

We present direct measurements of the superconducting order parameter in nearly optimal FeSe $_{0.5}$ Te $_{0.5}$ single crystals with critical temperature $T_{C} \approx 14$ K. Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy and measurements of lower critical field, we directly determined two superconducting gaps, $Δ_{L} \approx 3.3 - 3.4$ meV and $\Delta_S \approx 1$ 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.

Direct Evidence of Two Superconducting Gaps in FeSe $_{0.5}$ Te $_{0.5}$ : SnS-Andreev Spectroscopy and Lower Critical Field

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Direct Evidence of Two Superconducting Gaps in FeSe $_{0.5}$ Te $_{0.5}$ : SnS-Andreev Spectroscopy and Lower Critical Field

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Direct Evidence of Two Superconducting Gaps in FeSe0.50.5​Te0.50.5​: SnS-Andreev Spectroscopy and Lower Critical Field

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Direct Evidence of Two Superconducting Gaps in FeSe0.50.5​Te0.50.5​: SnS-Andreev Spectroscopy and Lower Critical Field

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Direct Evidence of Two Superconducting Gaps in FeSe $_{0.5}$ Te $_{0.5}$ : SnS-Andreev Spectroscopy and Lower Critical Field

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Direct Evidence of Two Superconducting Gaps in FeSe $_{0.5}$ Te $_{0.5}$ : SnS-Andreev Spectroscopy and Lower Critical Field

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AI智能校验