Sr 2 RuO 4 is a superconductor with a similar structure to a high-T c cuprate superconductor. Nevertheless, the superconducting state may have different symmetry than that of cuprate superconductors. Strong Hund's rule coupling favours triplet over singlet pairing, similar to 3 He. A strong candidate is the odd-parity pairing state which is the two-dimensional analogue of the Balian-Werthamer state of 3 He. Various experimental consequences and tests are analysed.
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Rice et al. (1995) studied this question.