We use a three-dimensional stacked triangular network of Josephson junctions as a model for the study of vortex structure in the mixed state of high Tc superconductors. We show that the addition of disorder destroys the first order melting transition occurring for clean samples. The melting transition splits in two different (continuous) transitions, occurring at temperatures Tᵢ and Tₚ (>Tᵢ). At Tᵢ the perpendicular-to-field superconductivity is lost, and at Tₚ the parallel-to-field superconductivity is lost. These results agree well with recent experiments in YBaCuO.
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Jagla et al. (1996) studied this question.
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