Inelastic neutron scattering study of the magnetic fluctuations in Sr${}_2$RuO${}_4$

Abstract

By performing time-of-flight neutron scattering measurements on a large amount of single crystals of Sr${}_2$RuO${}_4$, we studied 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 at around ${\mathbf{Q}}_{\text{c}}=(0.3,0.3)$ up to at least $\hslash \omega =80$ meV. In addition, our data also show strong magnetic fluctuations that exist on the ridges connecting the IC peaks around the $(\pi ,\pi )$ point rather than around the $\Gamma$ 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.

References in corpus (4)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Upper limit on spontaneous supercurrents in Sr${}_2$RuO${}_4$
• Hidden quasi one-dimensional superconductivity in Sr${}_2$RuO${}_4$
• Lattice dynamics and electron-phonon coupling in Sr2RuO4

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