Above-ordering-temperature large anomalous Hall effect in a triangular-lattice magnetic semiconductor

Abstract

We observe magnetotransport coupled to noncoplanar spin ordering/fluctuation in a triangular-lattice magnetic semiconductor.

Multiple Magnetic Phases and Anomalous Hall Effect in Sb1.9Fe0.1Te2.85S0.15 Topological Insulators

“…The microscopic origin of this AHE is (a) intrinsic Berry curvature effects where the anomalous Hall conductivity σ A xy scales quadratically with longitudinal conductivity σ xx (σ A xy ∝ σ 2 xx ) and (b) extrinsic effects like skew scattering (σ A xy ∝ σ xx ) and side jump (σ A xy ∝ σ 2 xx ). Presently, the frustrated structures, noncollinear magnetism, some spin-ice, and spin-liquid state have proved to be the topic of significant interest in the AHE research. − The present system follows the proposed “spin cluster” mechanism by Ishizuka and Nagaosa . When an external field causes a distortion of the local order, magnetic fluctuations act as scattering centers, providing an enhanced skew scattering potential.…”

“…The Hall angle is σ (AHE) xy /σ xx ∼ 0.063, comparatively larger than the conventional limit of AHA∼ 10 –3 –10 –2 . However, the AH conductivity and transverse conductivity are not that large (σ A xy ∼ 101.3 Ω –1 cm –1 , σ xx ∼ 909.5 Ω –1 cm –1 at 2 K) as specified in enhanced skew scattering cases produced by the multispin/tilted spin-cluster/geometrically frustrated lattice. ,, …”

“…33 However, the AH conductivity and transverse conductivity are not that large (σ A xy ∼ 101.3 Ω −1 cm −1 , σ xx ∼ 909.5 Ω −1 cm −1 at 2 K) as specified in enhanced skew scattering cases produced by the multispin/tilted spin-cluster/geometrically frustrated lattice. 29,30,34 DC Magnetization Studies. In order to explore the magnetic behavior of the Sb 1.9 Fe 0.1 Te 2.85 S 0.15 single crystal, the temperature dependence of zero field cooled−field warm (ZFC−FW) and field cooled−field warm (FC−FW) magnetization with an external field of 100, 1000, and 4000 Oe is recorded in the temperature range 2−350 K and is shown in Figure 4a.…”

Anomalous Hall effect sensitive to magnetic monopoles and skyrmion helicity in spin–orbit coupled systems

“…However, in the cases considered so far, the correction remains relatively small [28] or vanishing [29]. In contrast, the effect of SOI on AHE is much less known for skew scattering by multiple magnetic moments [5,15], which potentially gives rise to a larger Hall effect as recently observed in experiment [31][32][33].…”

Maximizing intrinsic anomalous Hall effect by controlling the Fermi level in simple Weyl semimetal films

“…EuCd 2 Sb 2 films were grown in an Epiquest RC1100 chamber [27][28][29][30] on single-crystalline (111)A CdTe substrates. In-plane lattice mismatch between EuCd 2 Sb 2 and CdTe is 2.4% as shown in Fig.…”