By performing time-of-flight neutron scattering measurements on a large sample of single crystals of Sr2RuO4, we studied the detailed structure of the imaginary part of the dynamic spin susceptibility over a wide range of phase space. In the normal state at T=5 K, strong incommensurate (IC) peaks were clearly observed around Qc=(0.3,0.3) up to at least ω=80 meV. In addition, our data also show strong magnetic fluctuations that exist on the ridges connecting the IC peaks around the (π,π) point rather than around the Γ point. Our results are consistent with the semi-mean-field random phase approximation calculation for a two-dimensional Fermi liquid with a characteristic energy of 5.0 meV. Furthermore, the IC fluctuations were observed even at room temperature.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2011 Aug 8