Abstract
We have calculated the non-Ohmic current-voltage characteristics of anisotropic three-dimensional Josephson-junction arrays as a model of layered high- T c oxides. Langevin dynamic simulations are performed for various Josephson-coupling anisotropies ( γ = J | c / J ⊥ c ) at finite temperature in zero and finite magnetic fields. We find that interlayer coupling gives rise to the non-vanishing critical current ( I c ), and that the low-temperature phase displays non-Ohmic power-law behavior ( V ( I − I c ) α−1 ). Moreover, in the γ-dependence of I c , we see the two-to three-dimensional crossover associated with thermally excited vortex-antivortex pairs.
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