Giant topological Hall effect in centrosymmetric tetragonal Mn2−xZnxSb

Abstract

Topological magnetism typically appear in non-centrosymmetric compounds or compounds with geometric frustration. Here, we report the effective tuning of magnetism in centrosymmetric tetragonal Mn 2−x Zn x Sb by Zn substitution. The magnetism is found to be closely coupled to the transport properties, giving rise to a very large topological hall effect with fine tuning of Zn content, which even persists to high temperature (∼ 250 K). The further magnetoentropic analysis suggests that the topological hall effect is possibly associated with topological magnetism. Our finding suggests Mn 2−x Zn x Sb is a candidate material for centrosymmetric tetragonal topological magnetic system, offers opportunities for studying and tuning spin textures and developing near room temperature spin-based devices.

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn2CoAl Heusler Compound

“…The contour mapping shows that a large ρ T persists up to room temperature around the field of 0.1 T and it converges to zero above the field of %0.3 T. Such behavior has been observed in similar systems due to fully spin-polarized state at higher magnetic field. [24,25,30,[33][34][35][38][39][40]42] The comparison with the previously reported bulk systems [4,12,19,30,35,[59][60][61][62][63][64][65][66][67][68][69][70] (Figure 2e) indicates that the large topological Hall persists in the wider temperature range of 2-300 K, which make the Mn 2 CoAl compound an ideal candidate for the spintronic applications. The moderate decrease in the maximum ρ T with temperature can be ascribed to the microscopic noncoplanar spin texture.…”

Magnetotransport and magnetic properties of Cr-modified Mn2Sb epitaxial thin films

“…[9][10][11][12] Very recently, Nabi et al observed a giant composition-tunable topological Hall effect up to B250 K in Mn 2-x Zn x Sb single crystals, which is caused by topological magnetic spin texture, suggesting that Mn 2 Sb-based compounds are good candidate materials for studying topological magnetism. 13,14 These results demonstrate that Mn 2 Sb-based compounds are good platforms for the fundamental study of interplay among the spin, charge, and lattice degrees of freedom.…”

Band splitting induced Berry flux and intrinsic anomalous Hall conductivity in the NiCoMnGa quaternary Heusler compound

“…It is worthwhile to mention here that intrinsic AHE is expected to dominate in the overall behaviour of AHE, when the longitudinal conductivity of sample lies in the good metallic regime i.e. σ xx is an order of 10 4 -10 6 S/cm [1,15,16,43,46]. Our system shows the deviation from this criterion as the extrinsic AHE has significant contribution in the AHE despite the σ xx is an order of 10 4 S/cm.…”