Gapped Collective Charge Excitations and Interlayer Hopping in Cuprate Superconductors
| Autor: | M. Hepting, M. Bejas, A. Nag, H. Yamase, N. Coppola, D. Betto, C. Falter, M. Garcia-Fernandez, S. Agrestini, Ke-Jin Zhou, M. Minola, C. Sacco, L. Maritato, P. Orgiani, H. I. Wei, K. M. Shen, D. G. Schlom, A. Galdi, A. Greco, B. Keimer |
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| Rok vydání: | 2022 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity Condensed Matter::Superconductivity Physics::Optics Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Physical Review Letters. 129 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We use resonant inelastic x-ray scattering (RIXS) to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr$_{0.9}$La$_{0.1}$CuO$_2$ (SLCO). We detect a plasmon gap of $\sim$~120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in SLCO are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered $t$-$J$-$V$ model calculations. A similar analysis performed on recent RIXS data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping $t_z$. Our work signifies the three-dimensionality of the charge dynamics in layered cuprates and provides a new method to determine $t_z$. Comment: 17 pages, 10 figures, includes Supplemental Material. Accepted for publication in Physical Review Letters |
| Databáze: | OpenAIRE |
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