Spin density wave fluctuations and p-wave pairing in Sr2RuO4
Jia-Wei Huo, T. M. Rice, and Fu-Chun Zhang
Accepted
Recently a debate has arisen over which of the two distinct parts of the Fermi surface of Sr2RuO4, is the active part for the chiral p-wave superconductivity. Early theories proposed p-wave pairing on the two dimensional g-band, while a recent proposal focuses on the one dimensional (a,b) bands whose nesting pockets are the source of the strong incommensurate spin density wave (SDW) fluctuations. We apply a renormalization group theory to study quasi-one dimensional repulsive Hubbard chains and explain the form of SDW fluctuations, reconciling the absence of long range order with their nesting Fermi surface. The mutual exclusion of p-wave pairing and SDW fluctuations in repulsive Hubbard chains favors the assignment of the two dimensional g-band as the source of p-wave pairing.