Several possible odd-parity states are listed up group-theoretically and examined in light of recent experiments on Sr2RuO4. Those include some of the f-wave pairing states, \mibd(\mibk)∝\mibz^kxky(kx+iky) and \mibz^(kx2−ky2)(kx+iky) and other \mibz^(kx+iky)cosckz (c is the c-axis lattice constant) as most plausible candidates. These are time-reversal symmetry broken states and have line nodes running either vertically (the former two) or horizontally (the latter), consistent with experiments. Characterizations of these states and other possibilities are given.
@article{arxiv.cond-mat/9909316,
title = {Spin triplet superconductivity with line nodes in Sr2RuO4},
author = {Yasumasa Hasegawa and Kazushige Machida and Masa-aki Ozaki},
journal= {arXiv preprint arXiv:cond-mat/9909316},
year = {2009}
}