In Sr2RuO4 the spin excitation spectrum is dominated by incommensurate fluctuations at q=(0.3 0.3 qz), which arise from Fermi-surface nesting. We show that upon Ti substitution, known to suppress superconductivity, a short range magnetic order develops with a propagation vector (0.307 0.307 1). This finding confirms that superconducting Sr2RuO4 is extremely close to an incommensurate spin density wave instability. In addition, the ordered moment in \srton ~ points along the c-direction, which indicates that the incommensurate spin fluctuations exhibit the anisotropy required to explain a p-wave spin triplet pairing.
@article{arxiv.cond-mat/0107579,
title = {Incommensurate magnetic ordering in Sr_2Ru_(1-x)Ti_xO_4},
author = {M. Braden and O. Friedt and Y. Sidis and P. Bourges and M. Minakata and Y. Maeno},
journal= {arXiv preprint arXiv:cond-mat/0107579},
year = {2009}
}