Single-stripe magnetic order and bilayer spin dynamics in single-crystalline La3Ni2O7

IF 38 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nature Materials Pub Date : 2026-10-02 DOI:10.1038/s41563-026-02768-3

Lixing Chen, Enkang Zhang, Yiqing Hao, Yinghao Zhu, Bingkun Cui, Douglas L. Abernathy, Travis J. Williams, Yoichi Ikeda, Hao Zhang, Feiyang Liu, Wenbin Wang, Qisi Wang, Jun Zhao

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Abstract

High-temperature superconductivity in pressurized and thin-film nickelates has generated intense interest, yet magnetism in their ambient-pressure parent phases remains poorly understood, despite its potentially crucial role in pairing. Progress has been limited by the lack of large single crystals suitable for neutron spectroscopy. Here we overcome this limitation and map the spin order and excitations of single-crystalline La3Ni2O7. We find single-stripe magnetic order with a finite spin gap, anisotropic in-plane excitations and pronounced bilayer modulation revealing antiferromagnetic interlayer coupling. The dispersion is captured by a bilayer Heisenberg-type model with strong interlayer exchange and competing in-plane couplings. Absolute normalization reveals that, although the spin-wave bandwidth is only about 25% of that in cuprates, the local dynamic susceptibility at comparable energies is enhanced, yielding a comparable total fluctuating moment. These results highlight intense mid-energy spin excitations rooted in substantial electronic correlations, establishing a magnetic framework distinct from cuprates and relevant to superconductivity in nickelates.

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单晶La3Ni2O7的单条磁序和双层自旋动力学

高压镍酸盐和薄膜镍酸盐的高温超导性引起了人们的强烈兴趣，然而，尽管在配对中发挥了潜在的关键作用，但其常压母相的磁性仍然知之甚少。由于缺乏适合于中子光谱学的大单晶，进展受到限制。本文克服了这一限制，绘制了单晶La3Ni2O7的自旋顺序和激发图。我们发现了具有有限自旋间隙的单条磁序、各向异性平面内激励和明显的双层调制，揭示了反铁磁层间耦合。色散由具有强层间交换和竞争面内耦合的双层海森堡模型捕获。绝对归一化表明，虽然自旋波带宽仅为铜酸盐的25%左右，但在相当能量下的局部动态磁化率得到了增强，产生了相当的总波动矩。这些结果强调了强烈的中能自旋激发植根于实质性的电子相关性，建立了与铜酸盐不同的磁框架，并与镍酸盐的超导性有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Materials 工程技术-材料科学：综合

CiteScore

62.20

自引率

0.70%

发文量

221

审稿时长

3.2 months

期刊介绍： Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.