تقرير
Emergence of flat bands and their impact on superconductivity of Mo$_5$Si$_{3-x}$P$_x$
| العنوان: | Emergence of flat bands and their impact on superconductivity of Mo$_5$Si$_{3-x}$P$_x$ |
|---|---|
| المؤلفون: | Khasanov, Rustem, Ruan, Bin-Bin, Shi, Yun-Qing, Chen, Gen-Fu, Luetkens, Hubertus, Ren, Zhi-An, Guguchia, Zurab |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | The first-principles calculations and measurements of the magnetic penetration depths, the upper critical field, and the specific heat were performed for a family of Mo$_5$Si$_{3-x}$P$_x$ superconducotrs. First-principles calculations suggest the presence of a flat band dispersion, which gradually shifts to the Fermi level as a function of phosphorus doping $x$. The flat band approaches the Fermi level at $x\simeq 1.3$, thus separating Mo$_5$Si$_{3-x}$P$_x$ between the purely steep band and the steep band/flat band superconducting regimes. The emergence of flat bands lead to an abrupt change of nearly all the superconducting quantities. In particular, a strong reduction of the coherence length $\xi$ and enhancement of the penetration depth $\lambda$ result in nearly factor of three increase of the Ginzburg-Landau parameter $\kappa=\lambda/\xi$ (from $\kappa\simeq 25$ for $x\lesssim 1.2$ to $\kappa\simeq 70$ for $x\gtrsim 1.4$) thus initiating the transition of Mo$_5$Si$_{3-x}$P$_x$ from a moderate to an extreme type-II superconductivity. Comment: 6 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2305.17669 |
| رقم الأكسشن: | edsarx.2305.17669 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |