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\underline {SUPERCONDUCTING AND PINNING PROPERTIES OF}\\
\underline{MULTILAYERS WITH DIFFERENT COHERENCE LENGTHS}\\
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\underline{T. Matsushita} and Y. Nakayama\\
Department of Computer Science and Electronics, \\ Kyushu
Institute of Technology,\\ 680--4 Kawazu, Iizuka 820, JAPAN\\
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Introduction of Nb layers as artificial pinning centers in  
superconducting Nb-Ti layers achieved very high critical  
current density.  To understand the mechanism of high  
critical current density even under a deteriorated upper  
critical field due to the proximity effect, the  
superconducting and pinning properties of thin multilayers  
composed of Nb-Ti and Nb under a normal magnetic field are  
theoretically investigated using the Ginzburg-Landau  
theory in this study.  It is found that the upper critical  
field of the multilayers is governed by the kinetic energy  
of the induced superconductivity in the Nb layer due to  
the proximity effect.  The diameter of normal core of flux  
line is modulated along the length and the modulation  
influences the elementary pinning force originated from  
the kinetic energy interaction.  The optimum structure for  
the superconducting and pinning properties is discussed.

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