Functional Integral Methods in the Study of Critical Fluctuations in Superconductors |
Common terms and phrases
aluminum granules becomes biquadratic approximation calculation clean QQ coefficients coherence length condensation conn current-current correlation function defined dependence diagram dimensional dirty limit diverge dt V{Q equations expand factor fluctuation free energy Fourier fourth order term free energy functional frequency functional integral functional integral method Ginzburg-Landau Green's function Hamiltonian Hence identical impurity scattering interaction picture m₁ mean field approximation mean field theory mean square fluctuations non-zero Note numbers obtain ODLRO order parameter P₂+Q2 partition function phase transition Qm Qm Qmax quantity region renormalized renormalized temperature shift resp result specific heat superconductor t-matrix approximation t(Qm t₂ tanh thermodynamic limit thermodynamic potential tion vanishes variables vertex vertex functions wavevector μν πρ Σ Σ