Superconducting Order Parameter and Bosonic Mode in Hydrogen-Substituted NdFeAsO$_{0.6}$H$_{0.36}$ Revealed by Multiple Andreev Reflection Spectroscopy
| Autor: | Kuzmicheva, T. E., Kuzmichev, S. A., Zhigadlo, N. D. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 100, 144504 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.100.144504 |
| Popis: | Using intrinsic multiple Andreev reflections effect (IMARE) spectroscopy, we studied ballistic superconductor - normal metal - superconductor (SnS) contacts in layered oxypnictide superconductors NdFeAsO$_{0.6}$H$_{0.36}$ with critical temperatures $T_c = 45-48$ K. We directly determined the magnitude of two bulk superconducting order parameters, the large gap $\Delta_L \approx 10.4$ meV, and a possible small gap $\Delta_S \approx 1.8$ meV, and their temperature dependence. Additionally, a resonant coupling with a characteristic bosonic mode was observed. The boson energy at 4.2 K, $\varepsilon_0 = 10.5-11.0$ meV being less than the indirect gap ($\Delta_L < \varepsilon_0 < \Delta_L +\Delta_S$). Comment: 10 pages, 6 figures |
| Databáze: | arXiv |
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