Abstract: | Current-voltage (I–V) characteristics are studied in the intrinsic Josephson junctions of Bi2Sr2CaCu2Oy single crystals. In order to examine the influence of self-heating, a current pulse (∼0.2 μsec) is applied to the mesas of 40 μmϕx0.15 μm patterned on the crystal. As a consequence, in contrast to small characteristic voltageV c in the continuous-current measurement, theV c data is found comparable to the BCS value. Moreover, theI–V curve is nearly ohmic forl>l c , implying that the nonlinearity under the continuous current is due to heating. The quasiparticle resistance forT c is also presented by an estimate from the characteristic voltage. |