Planar Hall effect in the quasi-two-dimensional topological semimetal candidate In0.93TaSe2

Abstract

Here, we report the systematic study on the planar transport properties of the quasi-two-dimensional (quasi-2D) topological nodal-line semimetal candidate In0.93TaSe2. When rotating magnetic field in the plane, the anisotropic longitudinal resistance and planar Hall resistance are clearly observed and can be well described by the theoretical formulation of the planar Hall effect (PHE). Further analysis demonstrates that the anisotropic orbital resistance rather than the topological-nontrivial chiral anomaly plays a dominant role on the PHE in In0.93TaSe2. Our study provides another platform for understanding the mechanism of PHE, which may also be valuable for future planar Hall sensors based on quasi-2D materials.

Planar Hall Effect and Quasi ‐ 2D Anisotropic Superconductivity in Topological Candidate 1T‐NbSeTe

“…The temperature variation of $$\Delta \rho _{xy}^{\text{chiral}}$$ continuously decreases with increasing temperature, as represented in Figure 2d, possibly due to an increasing thermal fluctuation effect within the system. [ 44 ]…”

“…The temperature variation of Δ𝜌 chiral xy continuously decreases with increasing temperature, as represented in Figure 2d, possibly due to an increasing thermal fluctuation effect within the system. [44] Furthermore, the normal Hall resistivity is measured by applying a magnetic field parallel to the c-axis or perpendicular to the ab-plane of the sample, as shown in the inset of Figure 2d. The Hall resistivity (𝜌 xy vs H) data is fitted with 𝜌 xy = R H H (where R H is the Hall coefficient) for 6 K. The carrier concentration is determined to be 2.22 (3) × 10 21 cm −3 using the relation R H = −1∕ne.…”

An ideal candidate for observing anomalous Hall effect induced by the in-plane magnetic field

“…However, experimental observations of the pure APHE remain scarce, and are only found in heterodimensional superlattice VS 2 /VS [16] and Dirac semimetal ZrTe 5 [17], as they are often accompanied by the planar Hall effect resulting from other mechanisms [18]. Most measurements in various materials, such as type-II Dirac semimetal NiTe 2 [19], topological insulator Bi 2 Te 3 [20], LaVO 3 /SrTiO 3 heterostructures [21], Cr 1/3 NbS 2 [22], and topological semimetal candidate In 0.93 TaSe 2 [23], find that the conductivity satisfies σ xy = J H /E ∝ B 2 sin 2θ with θ being the angle between electric and magnetic fields. This Hall conductivity in twodimensional systems arises from the classical Drude conductivity and is referred to as the conventional planar Hall effect (CPHE), as depicted in figure 1(c).…”