Magnetic and transport properties of Sb2Te3 doped with high concentration of Cr

TL;DR

This study investigates Cr-doped Sb2Te3, demonstrating high Curie temperatures up to 250 K and establishing the material's potential as a magnetic topological insulator with phase stability up to a certain doping level.

Contribution

It reports the synthesis and characterization of Cr-doped Sb2Te3 with high doping levels and high Curie temperature, advancing the understanding of magnetic topological insulators.

Findings

Cr substitutes Sb in Sb2Te3 lattice

Single-phase crystals achieved up to x=0.44 Cr doping

Curie temperature reaches 250 K at high doping levels

Abstract

We report on molecular beam epitaxy and properties of a magnetic topological insulator, Cr doped Sb2Te3. The composition analysis reveals that Cr replaces Sb site, and x-ray diffraction confirms that single phase textured crystal structure can be obtained for (CrxSb1-x)2Te3 with x up to 0.44. Further increase in x results in phase separation or precipitates in the material. The Curie temperature TC increases with x up to 0.44, and reaches to 250 K, which is the highest TC observed till now in magnetically doped topological insulators.