Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Frustrated Magnets - α-RuCl3 and Cu-based Materials
TT 64.12: Vortrag
Mittwoch, 14. März 2018, 18:00–18:15, HFT-FT 101
Anomalous Hall effect in frustrated antiferromagnet HoAgGe — •Kan Zhao and Philipp Gegenwart — Experimentalphysik VI, University Augsburg
Geometric frustration in magnetic systems arises from competing magnetic interactions that cannot be satisfied simultaneously and leads to a variety of exotic ground states. Recent theoretical calculations show frustrated antiferromagnet Mn3Ir will exhibit the anomalous hall effect (AHE), because of the three rotation symmetry of Mn kagome lattice. Then the AHE is observed in non collinear antiferromagnet Mn3Sn at 300K due to the Berry curvature in momentum space.
HoAgGe, which crystallize in the hexagonal ZrNiAl-type structure, is an antiferromagnet below 11K. The Ho atoms form a distorted Kagome lattice. With high quality single crystal, we investigate the transport and magnetic property at 2K. Obvious hysteresis can be observed from hall resistance and magnetroresistance between 1T and 3T. However, there is no hysteresis from M(H) curve at the same field region, indication the hysteresis not coming from the magnetization. There are probably some non collinear antiferromagnetic structure under field, which has no contribution to magnetization, but will contribute to the anomalous hall effect (AHE), namely the hysteresis in hall resistance between increasing and decreasing field.
To investigate the origin of AHE in this system, we conduct single crystal neutron diffraction at 2K and under magnetic field. And the determination of the non collinear frustrated magnetic structure of HoAgGe is still in progress.