Incommensurate magnetic orders and topological Hall effect in the square-net centrosymmetric EuGaAl system
arXiv:2110.11935 · doi:10.1103/PhysRevMaterials.6.074201
Abstract
Neutron diffraction on the centrosymmetric square-net magnet EuGaAl reveals multiple incommensurate magnetic states (AFM1,2,3) in zero field. In applied field, a new magnetic phase (A) is identified from magnetization and transport measurements, bounded by two of the ~=~0 incommensurate magnetic phases (AFM1,helical and AFM3, cycloidal) with different moment orientations. Moreover, magneto-transport measurements indicate the presence of a topological Hall effect, with maximum values centered in the A phase. Together, these results render EuGaAl a material with non-coplanar or topological spin texture in applied field. X-ray diffraction reveals an out-of-plane (OOP) charge density wave (CDW) below 50 K while the magnetic propagation vector lies in plane below = 19.5 K. Together these data point to a new route to realizing in-plane non-collinear spin textures through an OOP CDW. In turn, these non-collinear spin textures may be unstable against the formation of topological spin textures in an applied field.
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