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Superconductivity Critical B field, thermodynamical proof

  1. Mar 9, 2010 #1
    1. The problem statement, all variables and given/known data
    Use a thermodynamic argument to show that a strong magnetic field will cause a transition from a super-conducting to a normal state.


    2. Relevant equations



    3. The attempt at a solution

    Most books seem to use, the fact that the gibbs function of the super-conducting and normal states are equal at the critical B field to then derive the change in entropy and heat-capacity between the two regimes. But assume the critical field from the meissner effect rather than prove in thermodynamically.

    I'm guessing you need an expression for the gibbs function of the super-conducting state and the normal state, and comparing them you'll be able to see that the application of a large B will make them equal, but I don't know how to formulate a gibbs function for both sates in term of parameters that you can compare.....any ideas? thankyou
     
  2. jcsd
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