Uniaxial pressure effects on spin-ice compound Dy 2Ti 2O 7

Abstract

We measured the magnetization curve of Dy 2Ti 2O 7 at T = 1.7 K under uniaxial pressure up to 13.0 kbar. The magnetic field ( H ) was applied along three crystal directions [0 0 1], [1 1 0] and [1 1 1]. Then the direction of applying pressure ( P ) was parallel to the field direction. For all directions, the magnetization almost saturates at around H = 3 T , and the saturation moment was suppressed with increasing pressure. This pressure-induced suppression of saturation moment can be quantitatively understood by assuming that the lattice distortion is as much as 1%. For P , H // [0 0 1], the pressure-induced enhancement of initial magnetic susceptibility was observed, while for other direction, it was suppressed by shrinkage. This enhancement of initial susceptibility for P , H // [0 0 1] should originate in some change of the degeneracy in the ground state.