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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 chainsRoland Schäfer1,2, Wanyin Cui1,3, Birgit Kießig1,3, Kai Grube1, •Jochen Zimmer2,3, Hannes Rotzinger2,3, and Alexey V. Ustinov2,31Institut 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).

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