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