Spin-Triplet Superconductivity with Line Nodes in Sr₂RuO₄

Abstract

Several possible odd-parity states are listed group-theoretically and examined in light of recent experiments on Sr₂RuO₄. These include some of the f-wave pairing states, d(k)∝ z k_xk_y(k_x + ik_y) and z (k_x²-k_y²)(k_x + ik_y) and other z (k_x + ik_y)cos ck_z (c is the c$-axis lattice constant) as the 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 experimental results. Characterizations of these states and other possibilities are given.