Critical Temperature, Critical Current, and Vortex Loops in 3D Anisotropic Josephson Junction Arrays.

  • Kawabata Chikao
    Faculty of Environmental Science and Technology, Okayama University, Okayama 700–8530
  • Takeuchi Masaki
    Faculty of Environmental Science and Technology, Okayama University, Okayama 700–8530
  • Shenoy Subodh R.
    Condensed Matter Group, Abdus Salam International Center for Theoretical Physics, Trieste 34100, Italy
  • Bishop Alan R.
    Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM87545, U.S.A.

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Monte Carlo simulations of a 3D anisotropic Josephson junction array are performed, to determine the critical temperature Tc(I, α) for the onset of phase incoherence. Here I is the external current drive at opposite surfaces, and α≡ EJ⊥/EJ// is the inter-/intra-layer Josephson coupling ratio. Tc(I, α) is equivalent to a critical current, Ic(T, α) for the breakdown of global phase coherence. The temperature and anisotropy dependence of Ic(T, α) supports a physical picture of two vortex populations, quasi-2D and 3D in nature at small and large scales respectively, separated by a length scale r-- 1/√ α .

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