We investigate the imaginary part of the wave vector dependent dynamic spin susceptibility in Sr2(Ru0.99Ti0.01)O4 as a function of temperature using neutron scattering. At T=5 K, two-dimensional incommensurate (IC) magnetic fluctuations are clearly observed around Qc=(0.3,0.3,L) up to approximately 60 meV energy transfer. We find that the IC excitations disperse to ridges around the (π,π) point. Below 50 K, the energy and temperature dependent excitations are well described by the phenomenological response function for a Fermi liquid system with a characteristic energy of 4.0(1) meV. Although the wave vector dependence of the IC magnetic fluctuations in Sr2(Ru0.99Ti0.01)O4 is similar to that in the Fermi liquid state of the parent compound, Sr2RuO4, the magnetic fluctuations are clearly suppressed by the Ti-doping.
@article{arxiv.1202.3654,
title = {Two-dimensional incommensurate magnetic fluctuations in Sr$_2$(Ru$_{0.99}$Ti$_{0.01}$)O$_4$},
author = {K. Iida and J. Lee and M. B. Stone and M. Kofu and Y. Yoshida and S. -H. Lee},
journal= {arXiv preprint arXiv:1202.3654},
year = {2015}
}