解孪晶NaFeAs中结构和磁性转变的电子重构
Electronic reconstruction through the structural and magnetic transitions in detwinned NaFeAs
摘要：
我们用角分辨光电子能谱研究了孪晶和去孪晶的铁磷属元素化合物NaFeAs。电子重建的不同签名被观察到发生在结构（TS）和磁性（TSDW）转变。在TS处，C4旋转对称性以正交dxz和dyz带的各向异性移位的形式被破坏。这种轨道各向异性的幅度迅速发展到接近完成时，接近TSDW，在该温度带折叠发生通过反铁磁有序波矢量。有趣的是，在TS的各向异性带移onsetting发展以这样一种方式，以提高嵌套条件中的C2对称状态，因此是密切相关的长程共线AFM秩序。此外，NaFeAs和Ba（Fe 1-xCox）2As 2中电子重构的类似行为表明，TS和TSDW之间的大轨道各向异性的快速发展可能是铁磷属元素化物电子相变的普遍特征，相关的轨道涨落可能在决定基态性质中起重要作用。
英文摘要：
We use angle-resolved photoemission spectroscopy to study twinned and detwinned iron pnictide compound NaFeAs. Distinct signatures of electronic reconstruction are observed to occur at the structural (TS) and magnetic (TSDW) transitions. At TS, C4 rotational symmetry is broken in the form of an anisotropic shift of the orthogonal dxz and dyz bands. The magnitude of this orbital anisotropy rapidly develops to near completion upon approaching TSDW, at which temperature band folding occurs via the antiferromagnetic ordering wave vector. Interestingly, the anisotropic band shift onsetting at TS develops in such a way to enhance the nesting conditions in the C2 symmetric state, hence is intimately correlated with the long range collinear AFM order. Furthermore, the similar behaviors of the electronic reconstruction in NaFeAs and Ba(Fe1-xCox)2As2 suggests that this rapid development of large orbital anisotropy between TS and TSDW is likely a general feature of the electronic nematic phase in the iron pnictides, and the associated orbital fluctuations may play an important role in determining the ground state properties.
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