Spin correlations in the pyrochlore antiferromagnet Y2 Ru2 O7 with Curie-Weiss temperature ΘCW *-1100 K and critical temperature TN =77 K were examined through neutron scattering. For TN <T< ΘCW/3 the data show spin relaxation with a rate Γ=1.17(9) kB T. For T< TN spectral weight moves to higher energies with substantial changes up to 4 kB TN. For T TN there is a Δ=11(1) meV energy gap and a pronounced spectral maximum at 19.7 meV. Throughout the temperature range examined, the wave vector dependence of inelastic scattering exhibits a broad peak for Qd≈3.8 (d is the Ru-Ru spacing) consistent with dipolar spin correlations.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 10 2008|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics