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<T
c
is also presented by an estimate from the characteristic voltage. |