标题： 准二维 Cr1+xTe2（x = 0.22）单晶中竞争磁序及其相关自旋-声子耦合效应的研究 显示英文标题

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

摘要： 准二维铬碲化物系统Cr1+xTe2（x = 0.22）的单晶通过熔融法合成，该系统结晶为三斜结构，c轴为生长方向。磁化测量显示，由于插入的Cr层的存在，铁磁和反铁磁交换相互作用共存并竞争。该晶体表现出一系列多样的磁转变。在冷却过程中，晶体在190 K发生顺磁到反铁磁转变，随后在约160 K进入铁磁态，并在较低温度75 K发生自旋倾斜。晶体结构中可能存在反演对称性的缺失，以及等温磁化中观察到的异常跳跃和回环，表明Cr1+xTe2（x = 0.22）晶体可能包含斯格明子。此外，在其磁转变的同时，从非对称温度依赖拉曼光谱获得的Breit-Wigner-Fano拟合参数中观察到了异常，证明了强自旋-声子耦合效应，这是生长晶体的固有特性。强烈的垂直磁各向异性以及稳健的自旋-声子耦合，使该系统成为潜在自旋电子学应用的有前途候选材料。 显示英文摘要

摘要： 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.