TUNNELING CHARACTERISTICS OF INTRINSIC JOSEPHSON JUNCTIONS IN (Bi1-xPbx)2Sr2CaCu2Oy SINGLE CRYSTALS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3718-3720 ◽  
Author(s):  
GIN-ICHIRO OYA ◽  
SHINNOSUKE NOZAWA ◽  
AKINOBU IRIE
Keyword(s):  
Single Crystals ◽  
Critical Current ◽  
Strong Correlation ◽  
Josephson Junctions ◽  
Josephson Tunneling ◽  
Intrinsic Josephson Junctions ◽  
Current Voltage ◽  
Structural Modulation ◽  
Current Densities ◽  
Current Voltage Characteristics

We have studied the current-voltage characteristics of intrinsic Josephson junctions in mesa-shaped Bi 2 Sr 2 CaCu 2 O y and ( Bi 1-x Pb x)2 Sr 2 CaCu 2 O y single crystals as a function of x. Pronounced Josephson tunneling characteristics, which are characterized by high critical current densities and multiple quasiparticle branches with clear subgap structures, have been observed for ( Bi ~0.8 Pb ~0.2)2 Sr 2 CaCu 2 O y. A strong correlation between the characteristics and structural modulation in this system has been found.

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