Specific heats of the pyrochlore compounds Y2Mo2O7 and Y2Ru2O7

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Abstract
The specific heats of the pyrochlore compounds Y2Mo2O7 were measured below 20 K. The Y2Ru2O7 data were found to be well described by the expression C=γT+αT3 below 7 K with a γ value of 2.92±0.1 mJ/mole K2 and an α value of 0.236±0.015 mJ/mole K4. A correct description for the Y2Mo2O7 data was not obvious since there was, in addition to γT+αT3 contributions, a Schottky‐like term with a maximum near 12 K plus a smaller contribution near 3.5 K of unknown origin. The γ and α values of 1.33±1 mJ/mole K2 and 0.973±0.06 mJ/mole K4, respectively, should be used with caution. Neutron diffraction data were taken at 300, 77, 13, and 4.2 K on Y2Mo2O7. The results indicated that no transition to an antiferromagnetically ordered state occurred down to 4.2 K.