| Autor: |
Peng, Y. Y., Boukahil, I., Krongchon, K., Xiao, Q., Husain, A. A., Lee, Sangjun, Li, Q. Z., Alatas, A., Said, A. H., Yan, H. T., Ding, Y., Zhao, L., Zhou, X. J., Devereaux, T. P., Wagner, L. K., Pemmaraju, C. D., Abbamonte, P. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Physical Review Materials 8, 024804 (2024) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevMaterials.8.024804 |
| Popis: |
Interlayer van der Waals (vdW) coupling is generic in two-dimensional materials such as graphene and transition metal dichalcogenides, which can induce very low-energy phonon modes. Using high-resolution inelastic hard x-ray scattering, we uncover the ultra-low energy phonon mode along the Cu-O bond direction in the high-$T_c$ cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+\delta}$ (Bi2201). This mode is independent of temperature, while its intensity decreases with doping in accordance with an increasing c-axis lattice parameter. We compare the experimental results to first-principles density functional theory simulations and identify the observed mode as a van der Waals phonon, which arises from the shear motion of the adjacent Bi-O layers. This shows that Bi-based cuprate has similar vibrational properties as graphene and transition metal dichalcogenides, which can be exploited to engineer novel heterostructures. |
| Databáze: |
arXiv |
| Externí odkaz: |
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