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arXiv 2402.00693cond-mat.str-el
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去孪晶 $BaFe_{2-x}Ni_{x}As_{2}$（$x$ = 0, 0.6）中的面内各向异性磁电阻

In-plane anisotropic magnetoresistance in detwinned $BaFe_{2-x}Ni_{x}As_{2}$ ($x$ = 0, 0.6)

Kelly J. Neubauer, Mason L. Klemm, Shirin Mozaffari, Lin Jiao, Alexei E. Koshelev, Alexander Yaresko, Ming Yi, Luis Balicas, Pengcheng Dai

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AI总结：

本文测量并比较去孪晶 $BaFe_2As_2$ 与非磁性 Ni 掺杂样品的面内 MR，发现低温高场下的强各向异性不能仅由 Fermi 面解释，而反映有序磁矩自旋取向相关的电荷-自旋耦合。

摘要：

理解磁性材料的磁电阻（MR）是揭示体系中轨道机制和电荷-自旋相互作用的基础。尽管包括 $BaFe_2As_2$ 在内的铁基高温超导体的母体态表现出由自旋和电荷关联导致的异常电子输运性质，但通过理解正交晶系反铁磁（AF）有序态中由孪晶畴引起的面内 MR 效应，仍可获得有价值的认识。在此，我们研究去孪晶 $BaFe_2As_2$ 中的面内磁电阻各向异性，并将结果与非磁性 Ni 掺杂样品进行比较。我们发现，在反铁磁有序态中，$BaFe_2As_2$ 表现出各向异性 MR，且该 MR 在低温和高场下变大。横向和纵向 MR 均具有高度各向异性，并依赖于磁场和电流的取向。这些结果无法由仅考虑各向异性 Fermi 面的计算完全解释。相反，有序磁矩的自旋取向也会影响 MR 效应，这表明 $BaFe_2As_2$ 中存在强电荷-自旋相互作用，而 Ni 掺杂材料中不存在这种相互作用。

英文摘要：

Understanding the magnetoresistance (MR) of a magnetic material forms the basis for uncovering the orbital mechanisms and charge-spin interactions in the system. Although the parent state of iron-based high-temperature superconductors, including $BaFe_2As_2$, exhibits unusual electron transport properties resulting from spin and charge correlations, there is still valuable insight to be gained by understanding the in-plane MR effect due to twin domains in the orthorhombic antiferromagnetic (AF) ordered state. Here, we study the in-plane magnetoresistance anisotropy in detwinned $BaFe_2As_2$ and compare the results to the non-magnetic Ni-doped sample. We find that in the antiferromagnetically ordered state, $BaFe_2As_2$ exhibits anisotropic MR that becomes large at low temperatures and high fields. Both transverse and longitudinal MRs are highly anisotropic and dependent on the field and current orientations. These results cannot be fully explained by calculations considering only the anisotropic Fermi surface. Instead, the spin orientation of the ordered moment also affects the MR effect, suggesting the presence of a large charge-spin interaction in $BaFe_2As_2$ that is not present in the Ni-doped material.

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