Direct Evidence of Two Superconducting Gaps in FeSe$_{0.5}$Te$_{0.5}$: SnS-Andreev Spectroscopy and Lower Critical Field
| Autor: | V. P. Martovitsky, D. A. Chareev, A. V. Sadakov, S. A. Kuzmichev, E. S. Mitrofanova, V. M. Pudalov, T. E. Kuzmicheva, A. R. Shipilov, A. S. Usoltsev, A. V. Muratov |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Coupling constant
Superconductivity Physics Physics and Astronomy (miscellaneous) Condensed matter physics Direct evidence Condensed Matter - Superconductivity Order (ring theory) FOS: Physical sciences 02 engineering and technology Approx 021001 nanoscience & nanotechnology 01 natural sciences Andreev reflection Superconductivity (cond-mat.supr-con) Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics 0210 nano-technology Spectroscopy Critical field |
| Zdroj: | JETP Lett. JETP Letters |
| Popis: | 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, $\Delta_L \approx 3.3 - 3.4$ 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. |
| Databáze: | OpenAIRE |
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