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The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 are experimental and theoreticalexemplars of highly frustrated magnetic materials. However, the effects of anapplied uniaxial pressure are not well studied, and here we reportmagnetization measurements of Ho2Ti2O7 under uniaxial pressure applied in the[001], [111] and [110] crystalline directions. The basic features are capturedby an extension of the dipolar spin ice model. We find a good match between ourmodel and measurements with pressures applied along two of the threedirections, and extend the framework to discuss the influence of crystalmisalignment for the third direction. The parameters determined from themagnetization measurements reproduce neutron scattering measurements we performunder uniaxial pressure applied along the [110] crystalline direction. In thedetailed analysis we include the recently verified susceptibility dependence ofthe demagnetizing factor. Our work demonstrates the application of a moderateapplied pressure to modify the magnetic interaction parameters. The knowledgecan be used to predict critical pressures needed to induce new phases andtransitions in frustrated materials, and in the case of Ho2Ti2O7 we expect atransition to a ferromagnetic ground state for uniaxial pressures above 3.3GPa.

Effects of uniaxial pressure on the spin ice Ho2Ti2O7