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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, d( k)∝ ẑ kₓky(kₓ + iky) and ẑ (kₓ²-ky²)(kₓ + iky) and other ẑ (kₓ + iky)cos ckz (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.
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Hasegawa et al. (2000) studied this question.
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