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arXiv 2602.06705cond-mat.str-el

铁基化合物NaFe$_{0.53}$Cu$_{0.47}$As中的准一维自旋激发

Quasi-one-dimensional spin excitations in the iron pnictide NaFe$_{0.53}$Cu$_{0.47}$As

Zhejiang University（浙江大学）；Rice University（莱斯大学）；STFC Rutherford Appleton Laboratory（STFC卢瑟福阿普顿实验室）；Oak Ridge National Laboratory（橡树岭国家实验室）；Renmin University of China（中国人民大学）

Yifan Wang, David W. Tam, Weiyi Wang, R. A. Ewings, J. Ross Stewart, Masaaki Matsuda, Chongde Cao, Changle Liu, Rong Yu, Pengcheng Dai, Yu Song

备注：
supplementary information available upon request
发表信息：
Phys. Rev. Lett. 136, 066503 (2026)
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AI总结：

本研究通过非弹性中子散射揭示了NaFe$_{0.53}$Cu$_{0.47}$As中的准一维自旋激发，发现其源于原子有序导致的磁性Fe链和非磁性Cu链，展示了磁性稀释对低维量子材料的形成作用。

摘要：

在模型一维（1D）相关系统中进行光谱测量，为理解其二维对应物提供了见解，包括铜酸盐和铁基/硫化物超导体。主要挑战是识别具有主导1D物理的此类相关系统。在本工作中，对NaFe$_{0.53}$Cu$_{0.47}$As单晶进行非弹性中子散射测量，直接揭示了准一维自旋激发，这些激发源于原子有序导致的磁性Fe和非磁性Cu链。主导的交换相互作用是沿着链的反铁磁性（SJ$_{\rm \parallel}$≈90.1(3)~meV），而链间耦合则要弱得多（SJ$_{\rm \perp}$≈-2.4(1)~meV和SJ$_{\rm c}$≈0.15(5)~meV）。NaFe$_{0.53}$Cu$_{0.47}$As中的准一维自旋激发源于Néel和条纹向量，其中Néel激发对Cu位上的Fe杂质敏感。准一维NaFe$_{0.53}$Cu$_{0.47}$As和准二维FeSe中的自旋激发表现出惊人的相似性，表明它们共存的条纹和Néel激发有共同的起源。我们的发现表明，磁性稀释在NaFeAs中导致其磁性自由度的维度减少，提供了一种发现低维量子材料的策略。

英文摘要：

Spectroscopic measurements in model one-dimensional (1D) correlated systems offer insights for understanding their two-dimensional counterparts, which include the cuprate and iron pnictide/chalcogenide superconductors. A major challenge is the identification of such correlated systems with dominantly 1D physics. In this work, inelastic neutron scattering measurements on NaFe$_{0.53}$Cu$_{0.47}$As single crystal directly reveal quasi-1D spin excitations, resulting from atomic order that lead to magnetic Fe and nonmagnetic Cu chains. The dominant exchange interaction is antiferromagnetic along the chain ($SJ_{\rm \parallel}\approx90.1(3)$~meV), whereas the inter-chain couplings are much weaker ($SJ_{\rm \perp}\approx-2.4(1)$~meV and $SJ_{\rm c}\approx0.15(5)$~meV). The quasi-1D spin excitations in NaFe$_{0.53}$Cu$_{0.47}$As stem from both the Néel and stripe vectors, with Néel excitations sensitive to Fe impurities on the Cu site. The spin excitations in quasi-1D NaFe$_{0.53}$Cu$_{0.47}$As and quasi-2D FeSe exhibit a striking resemblance, suggesting a common origin for their coexistent stripe and Néel excitations. Our findings demonstrate magnetic dilution in NaFeAs leads to dimension reduction of its magnetic degree of freedom, presenting a strategy for discovering low-dimensional quantum materials.

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