Arjun Raghavan, Marisa Romanelli, Julian May-Mann, Anuva Aishwarya, Leena Aggarwal, Anisha G. Singh, Maja D. Bachmann, Leslie M. Schoop, Eduardo Fradkin, Ian R. Fisher, Vidya Madhavan
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引用次数: 0
摘要
碲化镉（GdTe3）是一种层状反铁磁体，因其超高的迁移率、独特的单向不对称电荷密度波（CDW）、压力下的超导性以及 7 至 12 K 之间的级联磁跃迁而备受关注，其阶次参数尚不清楚。在这里，我们使用自旋偏振扫描隧道显微镜直接对 GdTe3 中的电荷和磁性阶次进行成像。在 7 K 以下，我们发现了一个条纹状的反铁磁相，其周期是钆晶格的两倍，并且垂直于 CDW。当我们加热样品时，我们发现了一个自旋密度波，其周期性与 7 至 12 K 之间的 CDW 相同；我们的朗道自由能模型支持这一阶段的可行性。我们的研究揭示了 GdTe3 中磁相的阶次参数，并展示了电荷和自旋之间的相互作用如何产生级联磁阶。
Atomic-scale visualization of a cascade of magnetic orders in the layered antiferromagnet GdTe3
GdTe3 is a layered antiferromagnet which has attracted attention due to its exceptionally high mobility, distinctive unidirectional incommensurate charge density wave (CDW), superconductivity under pressure, and a cascade of magnetic transitions between 7 and 12 K, with as yet unknown order parameters. Here, we use spin-polarized scanning tunneling microscopy to directly image the charge and magnetic orders in GdTe3. Below 7 K, we find a striped antiferromagnetic phase with twice the periodicity of the Gd lattice and perpendicular to the CDW. As we heat the sample, we discover a spin density wave with the same periodicity as the CDW between 7 and 12 K; the viability of this phase is supported by our Landau free energy model. Our work reveals the order parameters of the magnetic phases in GdTe3 and shows how the interplay between charge and spin can generate a cascade of magnetic orders.
期刊介绍：
npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.
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