Pair and quasiparticle tunneling characteristics of small-sized intrinsic Josephson junctions in Bi2Sr2CaCu2Oy

Tunneling properties of small-sized intrinsic Josephson junctions in Bi2Sr2CaCu2Oy single crystals have been investigated in order to understand their inherent properties. Authors have fabricated mesas with lateral dimensions ranging from sub-mm2 to several tens mm2 on the same crystal. A clear gap...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-02, Vol.367 (1-4), p.393-399
Main Authors: Irie, Akinobu, Oya, Gin-ichiro
Format: Article
Language:English
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Summary:Tunneling properties of small-sized intrinsic Josephson junctions in Bi2Sr2CaCu2Oy single crystals have been investigated in order to understand their inherent properties. Authors have fabricated mesas with lateral dimensions ranging from sub-mm2 to several tens mm2 on the same crystal. A clear gap structure and the normal resistance region could be observed without overheating together with typical multiple branches. The gap value was about 60 meV at 4.2 K, while the IcRn product was about 2.4 mV. Authors observed that the temperature dependence of Ic slightly deviates from the Ambegaoker-Baratoff relation for the s-wave superconductor. This is interpreted as evidence of the d-wave symmetry of the order parameter and coherent interlayer tunneling. Authors also found that the pseudogap may be different from the precursor of superconductivity. 20 refs.
ISSN:0921-4534
DOI:10.1016/S0921-4534(01)01038-3