The Coherence Field in the Field Perturbation Theory of Superconductivity

Details The Coherence Field in the Field Perturbation Theory of Superconductivity The Coherence Field in the Field Perturbation Theory of Superconductivity

2006-07-23

arxiv.org/abs/cond-mat/0607586v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We re-examine the Nambu-Gorkov perturbation theory of superconductivity on the basis of the Bogoliubov-Valatin quasi-particles. We show that two different fields (and two additional analogous fields) may be constructed, and that the Nambu field is only one of them. For the other field- the coherence field- the interaction is given by means of two interaction vertices that are based on the Pauli matrices tau1 and tau3. Consequently, the Hartree integral for the off-diagonal pairing self-energy may be finite, and in some cases large. We interpret the results in terms of conventional superconductivity, and also discuss briefly possible implications to HTSC.

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