تقرير
Superconducting properties of Pr-based Filled skutterudite PrRu$_4$As$_{12}$
| العنوان: | Superconducting properties of Pr-based Filled skutterudite PrRu$_4$As$_{12}$ |
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| المؤلفون: | Namiki, T., Aoki, Y., Sato, H., Sekine, C., Shirotani, I., Matsuda, T. D., Haga, Y., Yagi, T. |
| المصدر: | J. Phys. Soc. Jpn. 76 (2007) 093704 |
| سنة النشر: | 2007 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity |
| الوصف: | We report on systematic study of superconducting characteristics and Pr crystalline-electric-field (CEF) levels of filled-skutterudite \pra ($T_{\rm c}$ = 2.33 K). The temperature dependences of the upper critical field $H_{\rm c2}$ and the Ginzburg-Landau (Maki) parameter $\kappa_2$ suggest an s-wave clean-limit superconductivity. The electronic specific heat coefficient $\gamma \sim 95$ mJ/K$^2$mol, being $\sim 1.5$ times larger than that for \lra, indicates $4f$-originating quasiparticle mass enhancement. Magnetic susceptibility $\chi(T)$ indicates that the CEF ground state is a $\Gamma_1$ singlet and a $\Gamma_4^{(1)}$ triplet first excited state lies at $\Delta_{\rm CEF}\sim 30$ K above. Systematic comparison among \pos, \prs, \pra and La-based reference compounds suggests that inelastic exchange- and aspherical-charge-scatterings of conduction electrons from CEF-split $4f$ levels play an essential role for the quasiparticle mass enhancement and the value of $T_{\rm c}$ in the Pr-based filled skutterudites. Comment: 4 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1143/JPSJ.76.093704 |
| URL الوصول: | http://arxiv.org/abs/0710.0439 |
| رقم الأكسشن: | edsarx.0710.0439 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1143/JPSJ.76.093704 |
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