FIGURE 1. The temperature-dependent resistivity 
(T) of Tl2Mn2O7 in 0 and 5 T applied fields.
From the following article:
Low-field magnetoresistance in the pyrochlore Tl2Mn2O7
H. Y. Hwang and S.-W. Cheong
Nature 389, 942-944(30 October 1997)
doi:10.1038/40093
Also shown is the MR, (
o - H)/o. We focus on the low-temperature MR below the ferromagnetic transition at 120 K.