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Tunneling and point contact investigations of La1.85Sr0.15CuO4
Authors:P Leiderer  R Feile  B Renker  D Ewert
Institution:(1) Institut für Physik, Johannes-Gutenberg-Universität, Postfach 3980, D-6500 Mainz, Federal Republic of Germany;(2) Institut für Nukleare Festkörperphysik, Kernforschungszentrum Karlsruhe, Postfach 3640, D-7500, Federal Republic of Germany
Abstract:The high-T c superconductor La1.85Sr0.15CuO4 was investigated by means of point contact and tunneling measurements on small-sized contacts. We find different values for the energy gap at different points of the samples. The ratio 2Delta/k B T c ranges from about 3 to 6. For some point contacts we observe a clear signature of a supercurrent. Data for the temperature dependence of the critical current are presented.
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