Anisotropic Spin Stripe Domains in Bilayer La$_3$Ni$_2$O$_7$
| Autor: | Gupta, N. K, Gong, R., Wu, Y., Kang, M., Parzyck, C. T., Gregory, B. Z., Costa, N., Sutarto, R., Sarker, S., Singer, A., Schlom, D. G., Shen, K. M., Hawthorn, D. G. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The discovery of superconductivity in La$_3$Ni$_2$O$_7$ under pressure has motivated the investigation of a parent spin density wave (SDW) state which could provide the underlying pairing interaction. Here, we employ resonant soft x-ray scattering and polarimetry on thin films of bilayer La$_3$Ni$_2$O$_7$ to determine that the magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying within the NiO$_2$ plane and perpendicular to $\mathbf{Q}_{SDW}$, but without the strong charge disproportionation typically associated with other nickelates. These stripes form anisotropic domains with shorter correlation lengths perpendicular versus parallel to $\mathbf{Q}_{SDW}$, revealing nanoscale rotational and translational symmetry breaking analogous to the cuprate and Fe-based superconductors, with Bloch-like antiferromagnetic domain walls separating orthogonal domains. Comment: 30 pages including supplementary, 4 figures + 9 supplementary figures |
| Databáze: | arXiv |
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