Strong-Coupling Superconductivity with Mixed Even- and Odd-Frequency Pairing
Abstract
We investigate general structure of Landau free energy for stabilizing a novel superconducting state with both even-frequency and odd-frequency components in gap function. On the basis of the Luttinger-Ward functional, we elucidate an emergent mixing between different "parities" in time. The simplest case of the conventional s-wave singlet mixed with the odd-frequency triplet state under broken time-reversal symmetry is examined to demonstrate the anomalous structure of the free-energy functional. The induced odd-frequency component alters behaviors of physical quantities from those obtained by neglecting the odd-frequency component. The novel mixed state may also be relevant to strong-coupling superconductivity coexisting with ferromagnetism.
Cite
@article{arxiv.1205.5746,
title = {Strong-Coupling Superconductivity with Mixed Even- and Odd-Frequency Pairing},
author = {Hiroaki Kusunose and Masashige Matsumoto and Mikito Koga},
journal= {arXiv preprint arXiv:1205.5746},
year = {2012}
}
Comments
11 pages, 7 figures