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Periodic Peak Modulations in Bi-2212 Stacks Coupled to a Submicrometer Hole

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1 Author(s)
S. -J. Kim ; Dept. of Mechatron. Eng., Cheju Nat. Univ., Jeju, South Korea

Coupled stacked Josephson junctions (SJJs) in high-Tc superconducting (HTS) Bi2Sr2CaCu2O8+d (Bi-2212) are fabricated with a refined coupling configuration of a hole. Two types of coupled SJJs with a completely perforated hole of 0.1 mum x 0.2 mum and 0.2 mum x 0.4 mum were fabricated by using a 3-D focused ion beam (FIB) etching method. Those SJJs exhibited clearly oscillated critical current Ic under external magnetic fields He. With applying He, the clear periodic modulation patterns of Ic are obtained and well fitted to the calculated value from the hole area of 0.02 mum2 , DeltaB(= Phi0/S) , where S is hole area. The width and uniform transport properties of SJJs are confirmed by flux flow resistance Rff-He measurement with a bias current Ib of 1 muA at 10 K. We also investigated external field angle thetasi dependence of junction resistance Rj at 1 T and 10 K. When a constant He of 1 T and a Ib of 1 muA are applied to the sample with changing thetasi , unspecified equidistant and periodic peak structures in SJJs were induced. Those peaks dependence on thetasi under He were experimentally observed by measurement of the Rj. We assign the origin of the peaks to the interrelations between the periodic mechanical vibrations of sample stage and the quantized flux behaviors around a submicrometer hole. Those peak structures of Ic and Rj could be excited by He,thetasi,Ib, and some external signals from the peculiar properties of SJJs coupled to a hole.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:19 ,  Issue: 3 )