• Off-diagonal long-range order and currents in weakly coupled superconductors

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    • Keywords


      ODLRO ; superconductor; Josephson equations

    • Abstract


      Within the framework of quasi equilibrium approximation, Josephson’s expression for current in a weakly coupled superconducting system is derived without the use of any specific microscopic model. It is based only on the existence of the off-diagonal long-range order in the two-particle reduced density matrix. Allowing for deviations from the quasi equilibrium approximation, generalised Josephson equations are obtained which include ohmic terms. The effect of relaxation and thermal fluctuations is examined in detail to emphasise the physical origin of various terms in the expression for current.

    • Author Affiliations


      S Rangarajan1 Sudhanshu S Jha1

      1. Tata Institute of Fundamental Research, Bombay - 400005
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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