Sr2IrO4中各向同性和各向异性场相关自旋动力学的Raman散射研究
Isotropic and Anisotropic Regimes of the Field-Dependent Spin Dynamics in Sr2IrO4: Raman Scattering Studies
摘要：
实验兴趣的一个主要焦点是在Sr 2 IrO 4已澄清这个强自旋-轨道耦合系统的磁激发如何不同于各向异性的2D自旋-1/2海森堡模型的预测，并探讨在何种程度上强自旋-轨道耦合影响的磁性能的虹彩酸盐。在这里，我们提出了一个高分辨率的非弹性光（拉曼）散射研究的低能量磁激发光谱的Sr 2 IrO 4和掺杂Eu掺杂Sr 2 IrO 4作为温度和外加磁场的函数。我们发现，高场（H>1.5 T）的Sr 2 IrO 4的面内自旋动力学是各向同性的，并由所施加的电场和小的面内铁磁自旋分量之间的相互作用引起的Dzyaloshinskiii-Moriya相互作用。然而，在较低的领域（H<1.5 T）的Sr 2 IrO 4的自旋动力学表现出重要的影响与层间耦合和面内各向异性，包括自旋翻转过渡在Hc的Sr 2 IrO 4发生不连续或通过连续旋转的自旋，这取决于所施加的场的面内取向。这些结果表明，面内各向异性和层间耦合效应对Sr 2 IrO 4的低场磁性和动力学性质起着重要作用。
英文摘要：
A major focus of experimental interest in Sr2IrO4 has been to clarify how the magnetic excitations of this strongly spin-orbit coupled system differ from the predictions of anisotropic 2D spin-1/2 Heisenberg model and to explore the extent to which strong spin-orbit coupling affects the magnetic properties of iridates. Here, we present a high-resolution inelastic light (Raman) scattering study of the low energy magnetic excitation spectrum of Sr2IrO4 and doped Eu-doped Sr2IrO4 as functions of both temperature and applied magnetic field. We show that the high-field (H>1.5 T) in-plane spin dynamics of Sr2IrO4 are isotropic and governed by the interplay between the applied field and the small in-plane ferromagnetic spin components induced by the Dzyaloshinskii-Moriya interaction. However, the spin dynamics of Sr2IrO4 at lower fields (H<1.5 T) exhibit important effects associated with interlayer coupling and in-plane anisotropy, including a spin-flop transition at Hc in Sr2IrO4 that occurs either discontinuously or via a continuous rotation of the spins, depending upon the in-plane orientation of the applied field. These results show that in-plane anisotropy and interlayer coupling effects play important roles in the low-field magnetic and dynamical properties of Sr2IrO4.
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