| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1801702 | Journal of Magnetism and Magnetic Materials | 2011 | 5 Pages |
The magnetic properties of R2Ru2O7 pyrochlore compounds (R=Yb, Dy) were studied using specific heat down to 0.4 K and bulk magnetic measurements. These two rare-earth elements were chosen to demonstrate the effect of Ru–R exchange interaction on R magnetic sublattice, in two cases of anisotropy: axial in Dy and planar in Yb. Dy2Ru2O7 undergoes a second order transition to a fully ordered state at 1.85 K with no signs of the spin-ice state. In Yb2Ru2O7 the Yb sublattice orders gradually around 8 K due to the Ru molecular field and no further transition is observed down to 0.4 K. Including the Ru molecular field at the R site in calculations based on crystal field parameters known from titanates R2Ti2O7, allowed us to interpret experimental data.
Research highlights► Dy magnetic moments in Dy2Ru2O7 order at 1.85 K. ► Ru molecular field acts ineffectively on Dy, but spin-ice state is suppressed. ► In Yb2Ru2O7, Ru molecular field induces gradual Yb ordering. ► We model Yb2Ru2O7 magnetic properties using Yb2Ti2O7-based CEF with Ru-field.
