Abstract
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 (; ) 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.
