Physics – Condensed Matter – Superconductivity
Scientific paper
2001-07-05
Fiz. Nizk. Temp. (Low Temp. Phys.) 2001, V27, N8, p.831
Physics
Condensed Matter
Superconductivity
4 pages incl. 3 figs., publ. in Fiz. Nizk. Temp. (http://fnte.ilt.kharkov.ua/list.html)
Scientific paper
10.1063/1.1399197
The superconducting gap in a CeRu$_{2}$ single crystal is investigated by point contacts. BCS-like behavior of the gap $\Delta $ in the temperature range below T$_{c}^{*}<$T$_{c}$, where T$_{c}$ is the critical temperature, is established, indicating the presence of a gapless superconductivity region (between T$_{c}^{*}$ and T$_{c}$). The pair-breaking effect of paramagnetic impurities, supposedly Ce ions, is taken into consideration using the Scalski-Betbeder-Matibet-Weiss approach based on Abrikosov-Gorkov theory. It allows us to recalculate the superconducting order parameter $\Delta ^{\alpha} $ (in the presence of paramagnetic impurities) and the gap $\Delta ^{P}$ (in the pure case) for the single crystal and for the previously studied polycrystalline CeRu$_{2}$. The value 2$\Delta^{P}$(0)$ \approx $2 meV, with 2$\Delta ^{P}$(0)$/$k$_{B}$T$_{c} \approx $3.75, is found in both cases, indicating that CeRu$_{2}$ is a ``moderate'' strong-coupling superconductor.
Haga Yoshinori
Hedo Masato
Inada Yasuhiro
Moskalenko V. A.
Naidyuk Yu. G.
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