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We report that the lattice constant of Dy$_2$Ge$_{2-x}$Si$_x$O$_7$ ($x=0,0.02, 0.08, 0.125$) can be systematically reduced by substituting thenon-magnetic germanium ion in the cubic pyrochlore oxide with silicon. Amulti-anvil high-pressure synthesis was performed up to 16 GPa and 1100$^\circ$C to obtain polycrystalline samples in a solid-state reaction.Measurements of magnetization, ac susceptibility, and heat capacity reveal thetypical signatures of a spin-ice phase. From the temperature shift of thepeaks, observed in the temperature-dependent heat capacity, we deduce anincrease of the strength of the exchange interaction. In conclusion, thereduced lattice constant leads to a changed ratio of the competing exchange anddipolar interaction. This puts the new spin-ice compounds closer towards thephase boundary of short-range spin-ice arrangement and antiferromagneticlong-range order consistent with an observed reduction of the monopole energyscale.

Tuning interactions in the spin-ice materials Dy$_2$Ge$_{2-x}$Si$_x$O$_7$ by silicon substitution