Volume 78, Number 3, May 2007
Article Number 37001
Number of page(s) 3
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 11 April 2007
EPL, 78 (2007) 37001
DOI: 10.1209/0295-5075/78/37001

Crossover from normal (N) Ohmic subdivision to superconducting (S) equipartition of current in parallel conductors at the N-S transition: Theory

N. Kumar

Raman Research Institute - Bangalore 560080, India

received 9 February 2007; accepted in final form 14 March 2007; published May 2007
published online 11 April 2007

The recently observed (S. SARANGI et al., J. Phys. Condens. Matter, 18 (2006) L143) equipartition of current in parallel at and below the Normal-Superconducting (N-S) transition can be understood in terms of a Landau-Ginzburg order-parameter phenomenology. This complements the explanation proposed earlier (see Sarangi et al.) based on the flux-flow resistance providing a nonlinear negative current feedback towards equipartition when the transition is approached from above. The present treatment also unifies the usual textbook inductive subdivision expected much below Tc, and the equipartition as Tc is approached from below. The question of metastability is also briefly discussed.

74.25.-q - Properties of type I and type II superconductors.
74.25.Dw - Superconductivity phase diagrams.
74.90.+n - Other topics in superconductivity.

© Europhysics Letters Association 2007