Experimental investigation of Co<sub>2</sub>MnGa: candidate for the first intrinsic, three-dimensional topological magnet.
POSTER
Abstract
To date, the field of topological phases of matter has focused on band inversions driven by spin-orbit coupling (SOC). An open frontier is the search for topological invariants driven instead by magnetism. Since magnetic exchange splitting can be much larger than SOC, band inversions in magnetic systems may allow robust topological transport at room temperature. Magnetism also allows new topological phenomena. For instance, the configuration of topological objects may change with the direction of sample magnetization. Recently, we used density functional theory (DFT) to predict that the ferromagnet Co2MnGa hosts a magnetic topological phase with a network of topological line nodes. Here we present a preliminary experimental investigation of Co2MnGa using transport and angle-resolved photoemission spectroscopy (ARPES). We observe a robust ferromagnetic order with a high Curie temperature of ~ 700 K. Our ARPES measurements are consistent with DFT in the magnetic phase, confirming that we access the magnetic band structure in ARPES. Our findings pave the way for the discovery of the first intrinsic, three-dimensional topological magnet in Co2MnGa.
*Work at Princeton was supported by the U.S. Department of Energy under Basic Energy Sciences Grant No. DOE/BES DE-FG-02-05ER46200.
Presenters
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Jiaxin Yin
- Princeton Univ