Magnetic order and crystal field in Dy2Ru2O7 and Yb2Ru2O7 |
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| Authors: | M. Rams A. ZarzyckiA. Pikul K. Tomala |
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| Affiliation: | a M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
b Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 54-422 Wroc?aw, Poland |
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| Abstract: | 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. |
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| Keywords: | Pyrochlore Heat capacity Crystal field |
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