Investigation of competing magnetic orders and the associated spin-phonon coupling effect in quasi-2D Cr1+xTe2 (x = 0.22) single crystal

TL;DR

This study investigates the complex magnetic transitions and strong spin-phonon coupling in quasi-2D Cr1+xTe2 (x=0.22) single crystals, revealing potential skyrmion hosting and implications for spintronics.

Contribution

It provides new insights into the competing magnetic orders and spin-phonon interactions in Cr1+xTe2, highlighting its potential for spintronic applications.

Findings

Multiple magnetic transitions at 190 K, 160 K, and 75 K.

Evidence of strong spin-phonon coupling from Raman spectra.

Possible skyrmion hosting due to lack of inversion symmetry.

Abstract

Single crystals of quasi-2D chromium telluride system represented by Cr1+xTe2 (x = 0.22), which crystallizes in the trigonal structure with the c-axis as the growth direction, are synthesized by the flux method. The magnetization measurements revealed the coexistence and competition between ferromagnetic and antiferromagnetic exchange interactions due to the presence of the intercalated Cr-layers. A series of diverse magnetic transitions is exhibited by the crystal. While cooling the crystal, it undergoes a paramagnetic to antiferromagnetic transition at 190 K, followed by a transition into a ferromagnetic state at around 160 K, and a spin-canting at a lower temperature of 75 K. A possible lack of inversion symmetry in the crystal structure, along with the observance of an unusual jump and loop opening in the isothermal magnetization suggests that the crystals Cr1+xTe2 (x = 0.22) may host skyrmions. Furthermore, concomitant to their magnetic transitions, anomalies were observed in the derived Breit-Wigner-Fano fit parameters obtained from the asymmetric temperature-dependent Raman spectra, evidencing a strong spin-phonon coupling effect, intrinsic to the grown crystals. A strong perpendicular magnetic anisotropy along with the robust spin-phonon coupling, makes the system a promising candidate for prospective spintronics applications.