In-Plane Ferromagnetism and Critical Dynamics in Alkali-Deficient K$_{1-x}$CrTe$_2$ (with $x \approx$ 0.3) Single Crystals

TL;DR

This study reports the synthesis and magnetic characterization of alkali-deficient K$_{1-x}$CrTe$_2$ single crystals, revealing in-plane ferromagnetism and dynamic magnetic behavior, contributing to understanding low-dimensional magnetism in layered van der Waals materials.

Contribution

It introduces a new alkali-deficient chromium telluride with unique ferromagnetic properties and in-plane magnetic anisotropy, expanding the family of 2D magnetic materials.

Findings

Sharp ferromagnetic transition at 117 K

In-plane magnetic anisotropy confirmed by measurements and DFT

Short-range magnetic order persists above T_C

Abstract

Layered chromium tellurides are model systems for studying low-dimensional magnetism in van der Waals materials. We report the synthesis and characterization of K$_{1-x}$CrTe$_2$ single crystals ($x \approx 0.3$), which crystallize in the $Cm$ space group with trigonal prismatic K$^+$ coordination, unlike the octahedral environments of more stoichiometric ACrX$_2$ compounds. Magnetization measurements show a sharp ferromagnetic transition at $T_{\rm C}=117$ K and in-plane magnetic anisotropy, supported by density functional theory. Neutron diffraction reveals ferromagnetic alignment of Cr spins within and between layers. This contrasts with the out-of-plane A-type antiferromagnetism in LiCrTe$_2$ and NaCrTe$_2$, but resembles CrTe$_2$. These differences likely arise from changes in interlayer spacing, Cr oxidation state, or stacking. AC susceptibility and $\mu$SR indicate short-range order above $T_{\rm C}$ and dynamic behavior below. Overall, K$_{1-x}$CrTe$_2$ provides a tunable platform for studying spin orientation and dimensionality in two-dimensional magnets.