Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: SC: Tunneling, Josephson Junctions, SQUIDs 1
TT 46.4: Talk
Thursday, March 17, 2011, 11:15–11:30, HSZ 301
Cooper pair propagation in Josephson junctions chains — Roland Schäfer1,2, Wanyin Cui1,3, Birgit Kießig1,3, Kai Grube1, •Jochen Zimmer2,3, Hannes Rotzinger2,3, and Alexey V. Ustinov2,3 — 1Institut für Festkörperphysik, Karlsruhe Intitute of Technology, 76021 Karlsruhe — 2DFG-Center for Functional Nanostructures, 76128 Karlsruhe — 3Physikalisches Institut, Karlsruhe Intitute of Technology, 76128 Karlsruhe
We have studied the transport properties of aluminum SQUID chains
comprising 255 loops. The chains form arrays of coupled islands
with a charging energy Ec which is of the order of the Josephson
coupling Ej at zero magnetic field. Ej can be tuned towards zero by
applying a magnetic field amounting to Φ0/2=h/4e per SQUID loop. Our
results are in accord with previous observations [1], displaying a
pronounced blockade of Cooper-pair transport at low voltages with a
hysteretic onset of a resistive branch. Above a destinct threshhold the
array is characterized by a field dependent, but in bias constant slope.
The branch scales like Ej2 and gives clear evidence
that charge transport is due to the incoherent motion of Cooper pairs.
P. Ågren, K. Andersson, and D. B. Haviland, J. Low Temp. Phys. 124, 291
(2001).