Interplay between electronic and lattice superstructures in La$_{2-x}$Ca$_{x}$CuO$_{4}$
| Autor: | Hameed, S., Liu, Y., Rabinovich, K. S., Kim, G., Wochner, P., Christiani, G., Logvenov, G., Higuchi, K., Brookes, N. B., Weschke, E., Yakhou-Harris, F., Boris, A. V., Keimer, B., Minola, M. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Complex oxides are well known to develop oxygen ordering patterns with well defined periodicities, but their interplay with electronic correlations remains largely unexplored. Here, we report resonant and non-resonant x-ray diffraction data indicating a four-unit-cell periodic superstructure related to oxygen vacancy ordering in La$_{2-x}$Ca$_{x}$CuO$_{4}$ films with doping levels from the underdoped ($x = 0.15$) to the extremely overdoped ($x = 0.50$) regime. Whereas the lattice superstructure is temperature independent up to 300 K, a strongly temperature dependent electronic charge density wave (CDW) is observed in the underdoped and slightly overdoped regimes ($x\leq0.20$). The periodicity, in-plane and out-of-plane correlation lengths of the CDW are locked in by the lattice superstructure. Our results highlight the necessity to consider lattice and electronic energetics on equal footing in the high-temperature oxygen-disordered phase to explain oxygen ordering phenomena in complex oxides. Comment: 4 figures, supplement included |
| Databáze: | arXiv |
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