Nonlinear current-voltage characteristics of three-dimensional Josephson-junction arrays with anisotropic interactions

Ryoko Sugano; Toshiyuki Onogi; Yoshimasa Murayama

doi:10.1103/PhysRevB.48.13784

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Nonlinear current-voltage characteristics of three-dimensional Josephson-junction arrays with anisotropic interactions

Ryoko Sugano, Toshiyuki Onogi, Yoshimasa Murayama

DOI 10.1103/PhysRevB.48.13784 · Physical Review B

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Abstract

We perform Langevin dynamic simulations to calculate the current-voltage (I-V) characteristics for anisotropic three-dimensional arrays of resistively shunted Josephson junctions as a high-Tc oxide model. In zero and finite applied magentic fields, at various Josephson-coupling anisotropies (γ=J‖‖c/J⊥c), we see that the interlayer Josephson coupling gives rise to a nonvanishing critical current (Ic), and the low-temperature phase displays non-Ohmic power-law I-V characteristics [V∝I(I-Ic)α−1]. Based on the γ dependence of Ic, we discuss the two- to three-dimensional crossover associated with thermal excitations of vortex-antivortex pairs.