Transport properties in Tl-Ba-Ca-Cu-O grain boundary junctions on SrTiO3 bicrystal substrates

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Abstract
We have investigated the electrical properties of Tl‐Ba‐Ca‐Cu‐O high‐T c superconductor bicrystal grain boundaryjunctions. The behavior of the transport parameters is very similar to those obtained in YBaCuO7−δjunctions. In particular, the temperature dependence of the critical current and the scaling behavior of the critical current density as a function of the misorientation angle were analyzed. Relatively good control of the transport parameters as a function of the misorientation angle has been achieved. The current‐voltage characteristics showed a resistively shunted junction model‐like behavior at large angles (θ≥20°); at lower angles, the characteristics were more flux‐flow like. Preliminary results on noise characteristics are also presented.