Anomalous Hall effect in the trigonal Cr5Te8 single crystal

Abstract

We report anomalous Hall effect (AHE) and transport properties of trigonal Cr5Te8 (tr-Cr5Te8) single crystals. The electrical resistivity as well as the Seebeck coefficient shows a clear kink at the paramagnetic-ferromagnetic transition of tr-Cr5Te8, which is also confirmed by the heat capacity measurement. The scaling behavior between anomalous Hall resistivity ρ A xy and longitudinal resistivity ρxx is linear below Tc. Further analysis suggests that the AHE in tr-Cr5Te8 is dominated by the skew-scattering mechanism rather than the intrinsic or extrinsic side-jump mechanism.

Van der Waals Superstructure and Twisting in Self-Intercalated Magnet with Near Room-Temperature Perpendicular Ferromagnetism

“…Among various vdW magnetic tellurides, the binary chromium telluride 1T-CrTe 2 has a ferromagnetic ordering temperature T c above room temperature, − which is significantly higher than that of the previously studied ternary chromium tellurides Cr 2 X 2 Te 6 (X = Si, Ge). ,,− Furthermore, a colossal anomalous Hall conductivity was recently observed in 1T-CrTe 2 with simultaneously large anomalous Hall angles and electrical conductivities distinct from other anomalous Hall materials, making it an excellent candidate for spintronics applications. , By intercalating Cr atoms into the vdW gap between the CrTe 2 layers, as shown in Figure a, different chromium telluride compounds Cr 1+δ Te 2 (0 < δ ≤ 1) are created. These different Cr 1+δ Te 2 phases have a broad range of magnetic ordering temperatures and novel magnetic phases. ,,,− For example, CrTe (or Cr 2 Te 2 ) thin films have been reported to exhibit the topological Hall effect, noted as strong evidence of a magnetic skyrmion phase . Similar topological spin textures have also been reported in Cr 2 Te 3 (or Cr 1.33 Te 2 ) thin films embedded with bismuth nanosheets …”

“…Indeed, varied T c values were reported in the same compounds of similar thickness (e.g., T c = 210 K versus 300 K for ∼9 nm thick CrTe 2 ), and in contrast to the anomalous thickness dependence previously discussed, other studies (i.e., 1T-CrTe 2 , Cr 3 Te 4 , and CrTe) suggested the absence of ,,,− or an opposite thickness dependence where the T c decreases with decreasing thickness . Since magnetism in bulk Cr 1+δ Te 2 is strongly dependent on the composition, ,,,,− the varied and sometimes contrasting magnetic properties of nanoplates and thin films may result from precisely how the excess Cr atoms are intercalated in the vdW gap; therefore, it is essential to correlate the magnetic phases with the details of Cr-intercalation to understand the intrinsic magnetism in this newly emerged vdW magnet family.…”

“…(c) Histogram showing the range of thicknesses of nanoplates studied during the magnetization measurements. (d) M – T curves of the sample showing a T c of ∼284 K with the T c of some known bulk chromium telluride compounds denoted along the horizontal axis. ,,,,− (e) M – H curves of the sample with the field aligned perpendicular (red) and parallel (blue) to the c -axis at T = 4 K.…”

Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

“…There are various stable stoichiometries reported for chromium chalcogenides [e.g., CrTe 23,24 , Cr 2 Te 3 25,26 , and Cr 5 Te 8 27,28 ] depending on the Cr vacancies that occur in intercalation. However, none of them belongs to layered compounds with interlayer vdW gap, except for CrTe 2 .…”

Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride

“…In recent years, a variety of novel two-dimensional (2D) van der Waals magnets have been discovered, founding a flourishing field of 2D magnetism [1]. Among these prospective compounds, binary chromium tellurides Cr 1−δ Te [2][3][4][5][6][7][8] are attractive owing to their rich magnetic properties, as well as inherent chemical and structural compatibility when heterostructuring [9] with other topological systems, such as tetradymite-type topological insulators [10] or chalcogenide-based Dirac/Weyl semimetals [11]. Furthermore, the broken time-reversal symmetry and the strong spin-orbit coupling (SOC) offer unique opportunities for the interplay between spin configurations and reciprocal-space topology [12][13][14].…”