Point contacts from BiCaSrCu2Ox

The properties of point-contacts between two pieces of BiCaSrCu2Ox-material were investigated. At 4.2 K critical currents of 200 μA could be obtained. The IcR product was typically 5-10 mV. The derivatives of the I-V characteristics showed local maxima around 25 mV, indicating the possibility of an energy gap of about 13 mV. The shape of the I-V characteristics was to a large extend independent of the contact pressure