Synthesis and physical properties of a new layered ferromagnet, Cr1.21Te2

TL;DR

This paper reports the synthesis and comprehensive characterization of a new layered ferromagnetic compound, Cr1.21Te2, revealing its structure, metallicity, and magnetic properties with potential applications in low-dimensional magnetism.

Contribution

The study introduces a novel layered ferromagnet Cr1.21Te2 with detailed structural, electronic, and magnetic characterization, including estimates of spin stiffness and excitation gap.

Findings

Cr1.21Te2 is a metallic ferromagnet with a transition at ~173 K.

The compound has a trigonal structure with partially occupied interstitial Cr sites.

Magnetic moments align along the c-axis, indicating anisotropic ferromagnetism.

Abstract

Single crystals of a new layered compound, Cr1.21Te2, was synthesized via a vapor transport method. The crystal structure and physical properties were characterized by single crystal and powder x-ray diffraction, temperature- and field-dependent magnetization, zero-field heat capacity and angle-resolved photoemission spectroscopy. Cr1.21Te2, containing two Cr sites, crystalizes in a trigonal structure with a space group P-3 (No. 147). The Cr site in the interstitial layer is partially occupied. Physical property characterizations indicate that Cr1.21Te2 is metallic with hole pockets at the Fermi energy and undergoes a ferromagnetic phase transition at ~173 K. The magnetic moments align along the c-axis in the ferromagnetic state. Based on low temperature magnetization, the spin stiffness constant D and spin excitation gap $\Delta$ were estimated according to Bloch's law to be D = 99 $\pm$ 24 meV $\r{A}^2$ and $\Delta$ = 0.46 $\pm$ 0.33 meV, suggesting its possible application as a low dimensional ferromagnet.