Abstract
We have studied the rare-earth titanate R2Ti2O7 (R=Ho, Tb) by powder neutron diffraction under pressure up to 6–8 GPa and down to 1.4 K. These compounds show magnetic short-range order at ambient pressure, respectively attributed to spin liquid (Tb) and dipolar spin ice (Ho) behaviors. In Tb2Ti2O7, pressure induces long-range antiferromagnetic order below TN=2.1 K. Ordered and liquid states coexist below TN, with a gradual transfer from the liquid to the ordered state as temperature decreases. The magnetic correlations are enhanced by pressure, and their q dependence is modified. In contrast in Ho2Ti2O7, no long-range order is induced and the magnetic correlations remain unchanged by pressure, showing that the dipolar spin ice state remains stable in this (P,T) range.
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