Magnetic anisotropy of the spin ice compound Dy2Ti2O7

Details Magnetic anisotropy of the spin ice compound Dy2Ti2O7 Magnetic anisotropy of the spin ice compound Dy2Ti2O7

2001-08-08

arxiv.org/abs/cond-mat/0108129v1

Phys. Rev. B 65, 054410 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.054410

We report magnetization and ac susceptibility of single crystals of the spin ice compound Dy2Ti2O7. Saturated moments at 1.8 K along the charasteristic axes [100] and [110] agree with the expected values for an effective ferromagnetic nearest-neighbor Ising pyrochlore with local <111> anisotropy, where each magnetic moment is constrained to obey the `ice-rule'. At high enough magnetic fields along the [111] axis, the saturated moment exhibits a beaking of the ice-rule; it agrees with the value expected for a three-in one-out spin configuration. Assuming the realistic magnetic interaction between Dy ions given by the dipolar spin ice model, we completely reproduce the results at 2 K by Monte Carlo calculations. However, down to at least 60 mK, we have not found any experimental evidence of the long-range magnetic ordering predicted by this model to occur at around 180 mK. Instead, we confirm the spin freezing of the system below 0.5 K.

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