Abstract

Using photolithography and Ar ion milling, we fabricate small mesas on top of the Bi 2.3 Pb 0.1 Sr 2 CaCu 2 O 8+y single crystals to study the inherent tunnelling property of intrinsic Josephson junctions. The I-V characteristics of the mesas show a typical multiple branches with large hysteresis. The return current I r depends on the N-th branch. The relation of I r and N follows I r= I 0* N m, where -1< m <0 might be related to the Coulomb blockade effect. The McCumber parameter βc of the samples is also investigated.

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