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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.15702 |
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Table of Contents:
- Vapor deposited two-dimensional Cr$_{7}$Te$_{8}$ displays unusual temperature dependent Hall effect properties, including a room temperature anomalous Hall effect, sign reversals of the Hall resistivity on cooling, and a peak in the Hall resistivity at low temperatures. The two dimensional Cr$_{7}$Te$_{8}$ heterostructures that form the basis of these measurements are hexagonal in structure. We study the magnetic and structural properties of bulk Cr$_{7}$Te$_{8}$ synthesized by quenching from 1000 $^{\circ}$C with the goal of relating the magnetic, structural, and electronic properties. This quenched phase is metastable, hexagonal, and displays different magnetic properties from the slow-cooled and more thermodynamically stable monoclinic phase. High-resolution x-ray diffraction of the quenched hexagonal phase finds a first-order transition to a lower symmetry monoclinic phase on \textit{heating} above $\sim$ 550 K. Magnetic susceptibility measurements of the quenched hexagonal phase reveal ferromagnetic ordering above room temperature, along with the two distinct transitions at $\sim$ 220~K and $\sim$ 70~K. Through neutron diffraction studies, we find the $\sim$ 220 K anomaly is a spin reorientation transition of the ferromagnetically aligned magnetic moments and the $\sim70$ K feature represents a transition from a high temperature ferromagnet to a low temperature antiferromagnet. We suggest that these magnetic transitions are related to changes in the unit cell dimensions and are connected to the temperature dependent Hall resisitivity studied in two-dimensional heterostructures. This implies a link between structural, magnetic, and electronic properties in the ``pseudo" two-dimensional chromium tellurides.