Al. Cornelius et Js. Gardner, Short-range magnetic interactions in the spin-ice compound HO2Ti2O7 - art.no. 060406, PHYS REV B, 6406(6), 2001, pp. 0406
Magnetization and susceptibility studies on single crystals of the pyrochlo
re Ho2Ti2O7 are reported. Magnetization isotherms are shown to be qualitati
vely similar to that predicted by the nearest-neighbor spin-ice model. Belo
w the lock-in temperature, T*similar or equal to1.97 K, magnetization is co
nsistent with the locking of spins along [111] directions in a specific two
-spins-in, two-spins-out arrangement. Below T* the magnetization for B para
llel to [111] displays a two step behavior signaling the breaking of the ic
e rules.