This week's seminar

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION
	
INFORMAL SEMINAR on   Disorder and strong electron correlations





Thursday, 30 March    -    11:00 a.m.




Room 239,  Main Bldg.- II floor




N. KUMAR    ( Raman Research Institute, Bangalore )



"Current division in parallel: A surprise"


	Abstract

Consider some pieces of a wire of superconducting material having 
unequal lengths in general and connected in parallel.  If, now, the 
combination, assumed to be in the normal state, is connected to a dc 
current source, the total current is known well to divide resistively.  
  If, on the other hand, the conductors were in the superconducting 
state, the current is again known, though less well now, to divide 
inductively.  If, however, the combination of the current carrying 
conductors, initially in the normal state is cooled to and below the 
superconducting transition temperature, the current distribution is 
experimentally found to evolve towards equipartition. This indeed is a 
surprise.  In this talk, I will present our experimental findings, and 
suggest a physical mechanism for and a theoretical treatment of this 
self-organization of the current towards equipartition on cooling 
through the transition.

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