Size Dependent Properties of the Intrinsic Josephson Junction in Bi-Sr-Ca-Cu-O Single Crystals in External Magnetic Fields

Nazia Jabeen ALI  Akinobu IRIE  Gin-ichiro OYA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.809-813
Publication Date: 2002/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Novel Devices and Device Physics
Keyword: 
Bi-Sr-Ca-Cu-O single crystal,  intrinsic Josephson junction,  lower critical magnetic field,  size dependent properties,  

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Summary: 
The size dependent properties of the intrinsic Josephson junctions in Bi2Sr2CaCu2Oy single crystal mesas in the external magnetic field are studied. The mesas of (1-140) µm long with 7-29 junctions were fabricated and their current-voltage characteristics were measured in external magnetic field applied parallel to the CuO2 layers up to 0.16 T. In zero magnetic field, multiple resistive branches with large hysteresis were observed in the current-voltage characteristics for the fabricated mesas. Almost identical critical currents were also observed for all the junctions in each mesa. With applied magnetic field, Ic of the longer mesas showed a complex magnetic field dependence as compared to that of the short mesas (of about 1 µm in length). It was observed that the lower critical magnetic field of the junctions decreased and approached a constant value with increasing number of junctions and also with increasing length of the junctions. Similar magnetic behavior was obtained by numerical simulations based on coupled sine-Gordon equations for such stacked junctions.