- #1
taishizhiqiu
- 63
- 4
When reading some material concerning Ginzburg-Landau theory of superconductors, I got the following sentence:
The appropriate thermodynamic potential for describing a superconductor in an applied magnetic field is the Gibbs free energy ##G## (natural variable ##H##) and not the Helmholtz free energy ##F## (natural variable ##B##).
I don't understand the sentence. In gas, Gibbs free energy is minimal in constant temperature and pressure. Does this sentence mean that in superconductors Gibbs free energy is minimal in constant ##T## and ##H##? I can't make sense out of it.
The appropriate thermodynamic potential for describing a superconductor in an applied magnetic field is the Gibbs free energy ##G## (natural variable ##H##) and not the Helmholtz free energy ##F## (natural variable ##B##).
I don't understand the sentence. In gas, Gibbs free energy is minimal in constant temperature and pressure. Does this sentence mean that in superconductors Gibbs free energy is minimal in constant ##T## and ##H##? I can't make sense out of it.