A lambda-integration-free Eilenberger free energy functional is derived from Luttinger-Ward theory and generalized to spin-triplet correlations and spin-dependent fields.
Such points, if they occur in- side the region swept by the λ-integration, produce imag- inary winding number contributions
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Quasiclassical expressions for the free energy of superconducting systems
A lambda-integration-free Eilenberger free energy functional is derived from Luttinger-Ward theory and generalized to spin-triplet correlations and spin-dependent fields.