Imaging spontaneous currents in superconducting arrays of pi-junctions (Articolo in rivista)

Type
Label
  • Imaging spontaneous currents in superconducting arrays of pi-junctions (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Frolov, SM; Stoutimore, MJA; Crane, TA; Van Harlingen, DJ; Oboznov, VA; Ryazanov, VV; Ruosi, A; Granata, C; Russo, M (2008)
    Imaging spontaneous currents in superconducting arrays of pi-junctions
    in Nature physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Frolov, SM; Stoutimore, MJA; Crane, TA; Van Harlingen, DJ; Oboznov, VA; Ryazanov, VV; Ruosi, A; Granata, C; Russo, M (literal)
Pagina inizio
  • 32 (literal)
Pagina fine
  • 36 (literal)
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  • 4 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Frolov, Sergey M.; Stoutimore, Micah J. A.; Crane, Trevis A.; Van Harlingen, Dale J.] Univ Illinois, Dept Phys, Urbana, IL 61801 USA; [Oboznov, Vladimir A.; Ryazanov, Valery V.] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia; [Ruosi, Adele] Univ Naples Federico 2, CNR, INFM Coherentia, I-80125 Naples, Italy; [Ruosi, Adele] Univ Naples Federico 2, Dipartimento Sci Fis, I-80125 Naples, Italy; [Granata, Carmine; Russo, Maurizio] Inst Cibernet E Caianiello, CNR, I-80078 Naples, Italy (literal)
Titolo
  • Imaging spontaneous currents in superconducting arrays of pi-junctions (literal)
Abstract
  • A charge current can flow between two superconductors separated by a thin barrier. This phenomenon is the Josephson effect, which enables a current to tunnel at zero voltage(1), typically with no phase shift between the superconductors in the lowest-energy state. Recently, Josephson junctions with ground-state phase shifts of pi, proposed by theory three decades ago(2), have been demonstrated(3-5). In superconducting loops, pi-junctions cause spontaneous circulation of persistent currents in zero magnetic field(2), in analogy to spin-1/2 systems(6). Here we use a scanning superconducting quantum interference device microscope(7) to image the spontaneous zero-field currents in superconducting networks of temperature-controlled pi-junctions with weakly ferromagnetic barriers(3). We find an onset of spontaneous supercurrents at the 0-pi transition temperature of the junctions, T pi approximate to 3 K. We image the currents in non-uniformly frustrated arrays consisting of cells with even and odd numbers of pi-junctions. Such arrays are attractive model systems for studying the exotic phases of the two-dimensional XY-model(8,9) and achieving scalable adiabatic quantum computers(10). (literal)
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