Characterization of anomalous pair currents in Josephson junction networks.
Measurements performed on superconductive networks shaped in the form of planar graphs display anomalously large currents when specific branches are biased. The temperature dependences of these currents evidence that their origin is due to Cooper pair hopping through the Josephson junctions connecting the superconductive islands of the array. The experimental data are discussed in terms of theoretical models which predict, for the system under consideration, an inhomogeneous Cooper pair distribution on the superconductive islands of the network as a consequence of a Bose-Einstein condensation phenomenon.
MINAS-Dipartimento di Fisica, Università di Roma Tor Vergata, I-00173 Roma, Italy.
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Ottaviani
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Lucci
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Menditto
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Merlo
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Salvato
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Cirillo
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Müller
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Weimann
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Castellano
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Chiarello
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Torrioli
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Russo
D003198:Computer Simulation; D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D008962:Models, Theoretical; D011789:Quantum Theory; D013696:Temperature
D003300:Copper