自旋轨道莫特绝缘体Sr2IrO4顺磁态中Jeff = 1/2等自旋的二维海森堡行为
Two-dimensional Heisenberg behavior of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4
摘要：
用共振磁X射线漫散射方法研究了自旋轨道Mott绝缘体Sr_2 IrO_4顺磁态中Jeff = 1/2等自旋的动力学关联。我们发现，即使在20 K以上的磁性有序温度的二维反铁磁涨落与一个大的面内相关长度超过100晶格间距。与简单的期望强磁各向异性与增强的自旋轨道耦合，我们发现了各向同性的同位旋关联，这是很好地描述了二维S = 1/2量子海森堡模型。估计的反铁磁耦合常数高达J ~ 0.1 eV，与小的Mott能隙（< 0.5 eV）相当，表明该自旋-轨道纠缠系统的Mott特性很弱。
英文摘要：
Dynamical correlations of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insu- lator Sr2IrO4 was revealed by resonant magnetic x-ray diffuse scattering. We found two-dimensional antiferromagnetic fluctuation with a large in-plane correlation length exceeding 100 lattice spacings at even 20 K above the mangnetic ordering temperature. In marked contrast to the naive expecta- tion of strong magnetic anisotropy associated with an enhanced spin-orbit coupling, we discovered isotropic isospin correlation that is well described by the two-dimensional S = 1/2 quantum Heisen- berg model. The estimated antiferromagnetic coupling constant as large as J ~ 0.1 eV that is comparable to the small Mott gap (< 0.5 eV) points the weak and marginal Mott character of this spin-orbital entangled system.
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