Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-22
J. Phys. Soc. Jpn. 80 (2011) 054702
Physics
Condensed Matter
Superconductivity
6 pages, in JPSJ format
Scientific paper
Since the first theoretical proposal by Berezinskii, an odd-frequency superconductivity has encountered the fundamental problems on its thermodynamic stability and rigidity of a homogenous state accompanied by unphysical Meissner effect. Recently, Solenov {\it et al}. [Phys. Rev. B {\bf 79} (2009) 132502.] have asserted that the path-integral formulation gets rid of the difficulties leading to a stable homogenous phase with an ordinary Meissner effect. Here, we show that it is crucial to choose the appropriate saddle-point solution that minimizes the effective free energy, which was assumed {\it implicitly} in the work by Solenov and co-workers. We exhibit the path-integral framework for the odd-frequency superconductivity with general type of pairings, including an argument on the retarded functions via the analytic continuation to the real axis.
Fuseya Yuki
Kusunose Hiroaki
Miyake Kazumasa
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