faster when the field is applied along the \[100\] direction, as can be seen in figure \[fig\_Xtal\_MH\] (the demagnetization corrections were made using the same procedure as the powder).

![$M$ vs $H_i$ for the single crystal at 90 mK. The internal field $H_i=H-NM$ was calculated with $N_{[100]}=3.38$ and $N_{[110]}=3.8$ (cgs units) from $M$ vs $T$ measurements. []{data-label="fig_Xtal_MH"}](Plot_YTO_100vs110_MH_Oe){width="7.0cm"}

Irreversibilities and Hysteresis
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![$M/H$ vs $T$ for the crushed powder for $H=2$ Oe measured in a ZFC-FC procedure. []{data-label="fig_ZFC-FC"}](Plot_YTOpwd_0114_ZFC-FC){width="7.0cm"}

Zero Field Cooled - Field Cooled (ZFC-FC) measurements of the magnetization as a function of temperature exhibit an irreversibility (see figure \[fig\_ZFC-FC\]). This irreversibility is suppressed when the field is increased and disappears for fields larger than 500 Oe. This can be understood as the freezing of domains in the ferromagnetic state. (Note that all the measurements shown in the main article were measured in field cooled conditions.)

In addition, hysteresis loops were performed. A small hysteresis opens below the transition. In the powder samples, the hysteresis is about 20 Oe in width at 80 mK (giving a coercive field of 10 Oe) and closes at about 500 Oe. The hysteresis is 10 Oe in width at 200 mK and disappears at the 