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Complex conductivity of proximity-superconducting Nb/Cu bilayers M. S. Pambianchi,* Lie Chen,
 

Summary: Complex conductivity of proximity-superconducting Nb/Cu bilayers
M. S. Pambianchi,* Lie Chen,
and Steven M. Anlage
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
Received 22 January 1996
The effective complex conductivity eff
1
eff
i 2
eff
of proximity-coupled Nb/Cu bilayer films at 11.7 GHz
is examined. The peak in the real part 1(T) just below Tc in bare Nb films gives way to a broader, shallower
peak in 1
eff
(T) as the Cu layer thickness increases, consistent with the existence of coherence effects in
proximity-superconducting Cu. The imaginary part 2
eff
(T) changes curvature from concave down to concave
up as the Cu thickness dN increases. We extract proximity-induced penetration depth in Cu in the range 320
N(0,0) 580 , with N(0,0) increasing slightly with increasing dN , and an order-parameter decay length

  

Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park

 

Collections: Materials Science