| Issue |
Europhys. Lett.
Volume 64, Number 1, October 2003
|
|
|---|---|---|
| Page(s) | 91 - 97 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00138-7 | |
| Published online | 01 November 2003 | |
Proximity effects in the superconductor/heavy-fermion
bilayer system 
1
Kamerlingh Onnes Laboratory, Leiden
University P.O. Box 9504, 2300 RA Leiden,
the Netherlands
2
Institut für Metallphysik und Nukleare
Festkörperphysik Technische Universität Braunschweig -
Mendelssohnstr. 3 38106 Braunschweig,
Germany
3
Faculty of Sciences, Vrije Universiteit - De Boelelaan
1081 NL-1081 HV Amsterdam, the Netherlands
Received:
20
March
2003
Accepted:
31
July
2003
We have investigated the proximity effect between a
superconductor (
) and a “heavy-fermion” system
(
) by measuring critical temperatures 
and parallel critical fields 
of
films with varying thickness deposited on 75
thick films of , and comparing the results with the
behavior of similar films deposited on the normal metal 
.
For on , we find a strong decrease of
with decreasing thickness and a finite
critical thickness of the order of 10. Also, dimensional
crossovers in are completely absent,
in strong contrast with 
. Analysis of the data by a
proximity effect model based on the Takahashi-Tachiki theory
shows that the data can be explained by taking into account both
the high effective mass (or low electronic diffusion constant),
and the large density of states at the Fermi energy
which characterize the heavy-fermion metal.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects
© EDP Sciences, 2003
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