Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnet TmB4

• Main Authors: Sunku, Sai Swaroop, Kong, Tai, Ito, Toshimitsu, Canfield, Paul C., Shastry, B. Sriram, Sengupta, Pinaki, Panagopoulos, Christos
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2018
• Subjects: DRNTU::Science::Physics; Frustrated Magnetism; Anomalous Hall Effect
• Online Access: https://hdl.handle.net/10356/89809; http://hdl.handle.net/10220/46385
• Institution: Nanyang Technological University

We study TmB, a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB4 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.