Hysteretic magnetoresistance and unconventional anomalous Hall effect in   the frustrated magnet TmB_4
  We study TmB_4, a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB_4 is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at low-temperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We propose that complex structures at magnetic domain walls may be responsible for the hysteretic MR and may also lead to the AHE. 
Sai Swaroop Sunku, Tai Kong, Toshimitsu Ito, Paul C. Canfield, B.   Sriram Shastry, Pinaki Sengupta, and Christos Panagopoulos
cond-mat.str-el