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The superconducting phase transition and gauge dependence | | Claude de Calan
; Flavio S. Nogueira
; | | Date: |
3 Sep 1999 | | Journal: | Phys. Rev. B 60, 11929 (1999) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | The gauge dependence of the renormalization group functions of the Ginzburg-Landau model is investigated. The analysis is done by means of the Ward-Takahashi identities. After defining the local superconducting order parameter, it is shown that its exponent $eta$ is in fact gauge independent. This happens because in $d=3$ the Landau gauge is the only gauge having a physical meaning, a property not shared by the four-dimensional model where any gauge choice is possible. The analysis is done in both the context of the $epsilon$-expansion and in the fixed dimension approach. It is pointed out the differences that arise in both of these approaches concerning the gauge dependence. | | Source: | arXiv, cond-mat/9909045 | | Services: | Forum | Review | PDF | Favorites | |
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