Superconducting gap and pair breaking in CeRu2 studied by point contacts

Moskalenko, Andriy V., Naidyuk, Y. G., Yanson, I. K., Hedo, M., Inada, Y., Onuki, Y., Haga, Y. and Yamamoto, E. 2001. Superconducting gap and pair breaking in CeRu2 studied by point contacts. Low Temperature Physics 27 (8) , pp. 613-615. 10.1063/1.1399197

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Abstract

The superconducting gap in a CeRu2 single crystal is investigated by point contacts. BCS-like behavior of the gap Δ in the temperature range below Tc∗ (Tc∗<Tc, where Tc is the critical temperature) is established, indicating the presence of a gapless superconductivity region (between Tc∗ and Tc). 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 Δα (in the presence of paramagnetic impurities) and the gap Δp (in the pure case) for the single crystal and for the previously studied polycrystalline CeRu2. The value 2Δp(0) ≈ 2 meV, with 2Δp(0)/kBTc ≈ 3.75, is found in both cases, indicating that CeRu2 is a “moderate” strong-coupling superconductor.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Institute of Physics
Last Modified:	23 Mar 2017 04:01
URI:	https://orca.cardiff.ac.uk/id/eprint/46009

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