تقرير
Analysis of the London penetration depth in Ni-doped CaKFe4As4
| العنوان: | Analysis of the London penetration depth in Ni-doped CaKFe4As4 |
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| المؤلفون: | Torsello, D., Cho, K., Joshi, K. R., Ghimire, S., Ummarino, G. A., Nusran, N. M., Tanatar, M. A., Meier, W. R., Xu, M., Budko, S. L., Canfield, P. C., Ghigo, G., Prozorov, R. |
| المصدر: | Phys. Rev. B 100, 094513 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: | We report combined experimental and theoretical analysis of superconductivity in CaK(Fe$_{1-x}$Ni$_x$)$_4$As$_4$ (CaK1144) for $x=$0, 0.017 and 0.034. To obtain the superfluid density, $\rho=\left(1+\Delta \lambda_L(T)/\lambda_L(0) \right)^{-2}$, the temperature dependence of the London penetration depth, $\Delta \lambda_L (T)$, was measured by using tunnel-diode resonator (TDR) and the results agreed with the microwave coplanar resonator (MWR) with the small differences accounted for by considering a three orders of magnitude higher frequency of MWR. The absolute value of $\lambda_L (T \ll T_c) \approx \lambda_L(0)$ was measured by using MWR, $\lambda_L (\mathrm{5~K}) \approx 170 \pm 20$ nm, which agreed well with the NV-centers in diamond optical magnetometry that gave $\lambda_L (\mathrm{5~K}) \approx 196 \pm 12$ nm. The experimental results are analyzed within the Eliashberg theory, showing that the superconductivity of CaK1144 is well described by the nodeless s$_{\pm}$ order parameter and that upon Ni doping the interband interaction increases. Comment: 8 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.100.094513 |
| URL الوصول: | http://arxiv.org/abs/1909.04734 |
| رقم الأكسشن: | edsarx.1909.04734 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.100.094513 |
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