Complete electrodynamics of a BCS superconductor with $\mu$eV energy scales: microwave spectroscopy on titanium at mK temperatures
| العنوان: | Complete electrodynamics of a BCS superconductor with $\mu$eV energy scales: microwave spectroscopy on titanium at mK temperatures |
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| المؤلفون: | Marc Scheffler, Martin Dressel, Markus Thiemann |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Superconductivity, Materials science, Condensed Matter - Superconductivity, chemistry.chemical_element, 02 engineering and technology, BCS theory, 021001 nanoscience & nanotechnology, 01 natural sciences, Superfluidity, chemistry, Conventional superconductor, Quantum electrodynamics, Condensed Matter::Superconductivity, 0103 physical sciences, Rotational spectroscopy, 010306 general physics, 0210 nano-technology, Penetration depth, Energy (signal processing), Titanium |
| الوصف: | We performed resonant microwave measurements on superconducting titanium (Ti) down to temperatures of 40~mK, well below its critical temperature $T_\mathrm{c} \approx 0.5$~K. Our wide frequency range 3.3-40~GHz contains the zero-temperature energy gap $2\Delta_0$ and allows us to probe the full electrodynamics of the superconducting state, including excitations across the gap and the low-frequency responses of superfluid condensate and thermal quasiparticles. The observed behavior follows the predictions of the BCS-based Mattis-Bardeen formalism, which implies that superconducting Ti is in the dirty limit, in agreement with our determination of the scattering rate. We directly determine the temperature dependence of the energy gap, which is in accordance with BCS predictions, and $2\Delta_0/k_\mathrm{B}T_\mathrm{c}\approx3.5$ with $\Delta_0 \approx$ 75~$\mu$eV. We also evaluate the penetration depth, and we characterize the behavior of superconducting Ti in external magnetic field. Comment: 6 figures |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c11af8c41fdbf0b413013a2c61e5587c http://arxiv.org/abs/1803.02736 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c11af8c41fdbf0b413013a2c61e5587c |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |