Europhys. Lett.
Volume 72, Number 3, November 2005
Page(s) 465 - 471
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 05 October 2005
Europhys. Lett., 72 (3), pp. 465-471 (2005)
DOI: 10.1209/epl/i2005-10260-6

Molecular induced field effect in superconducting $\chem{Nb}$ films

Dm. Shvarts1, M. Hazani1, B. Ya. Shapiro2, G. Leitus3, V. Sidorov1 and R. Naaman1

1  Department of Chemical Physics, Weizmann Institute of Science Rehovot 76100, Israel
2  Physics Department, Bar-Ilan University - Ramat Gan 52900, Israel
3  Chemical Research Support, Weizmann Institute of Science Rehovot 76100, Israel

received 6 June 2005; accepted in final form 14 September 2005
published online 5 October 2005

The study of the effect of self-assembled organic monolayers on the critical current in thin superconducting Nb films is presented. Correlation is found between the coverage of the adsorbed layer and the critical current. A large change of up to 50% in the critical current by the well-organized monolayers is observed. The phenomenon is explained by the adsorption-induced electric field effect diminishing the surface pinning force.

74.78.-w - Superconducting films and low-dimensional structures.
82.65.+r - Surface and interface chemistry; heterogeneous catalysis at surfaces.
68.47.Pe - Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces.

© EDP Sciences 2005