论文标题
BAFE2S3中的轨道和磁性nematic稳定性之间的二分法
Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3
论文作者
论文摘要
在基于铁的超导体中，几乎普遍出现了列表，但是由于轨道和磁波动之间的紧密耦合，阐明其起源是具有挑战性的。在压力下超导导的铁基梯子材料BAFE2S3在Tn〜117K以下表现出抗铁磁顺序，而T* 〜180K处的弱电阻率异常，其性质仍然难以捉摸。在这里，我们报告了BAFE2S3中的角度分辨磁倍率（MR）和弹性（ER）测量值，这些测量显示在T*时揭示了明显的变化。我们发现，各向异性和ER nematic反应都在T*附近被抑制，这意味着促进各向同性电子状态的轨道顺序在T*处稳定。这种低于T*的各向同性状态与抗磁磁性阶竞争，这是由非单调温度依赖性的列源波动所证明的。与铁pnictides中的自旋和轨道通道中的合作列表相反，目前的竞争订单可以提供一个新的平台来识别轨道和磁波的单独作用。
Nematic orders emerge nearly universally in iron-based superconductors, but elucidating their origins is challenging because of intimate couplings between orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3, which superconducts under pressure, exhibits antiferromagnetic order below TN ~ 117K and a weak resistivity anomaly at T* ~ 180K, whose nature remains elusive. Here we report angle-resolved magnetoresistance (MR) and elastoresistance (ER) measurements in BaFe2S3, which reveal distinct changes at T*. We find that MR anisotropy and ER nematic response are both suppressed near T*, implying that an orbital order promoting isotropic electronic states is stabilized at T*. Such an isotropic state below T* competes with the antiferromagnetic order, which is evidenced by the nonmonotonic temperature dependence of nematic fluctuations. In contrast to the cooperative nematic orders in spin and orbital channels in iron pnictides, the present competing orders can provide a new platform to identify the separate roles of orbital and magnetic fluctuations.
