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- Title
Magnon interactions in a moderately correlated Mott insulator.
- Authors
Wang, Qisi; Mustafi, S.; Fogh, E.; Astrakhantsev, N.; He, Z.; Biało, I.; Chan, Ying; Martinelli, L.; Horio, M.; Ivashko, O.; Shaik, N. E.; Arx, K. von; Sassa, Y.; Paris, E.; Fischer, M. H.; Tseng, Y.; Christensen, N. B.; Galdi, A.; Schlom, D. G.; Shen, K. M.
- Abstract
Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO2, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La2CuO4 indicate that quantum fluctuations are much stronger in SrCuO2 suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO2—due to strong quantum fluctuations—is a unique starting point for the exploration of novel magnetic ground states. Magnetic excitations in infinite-layer cuprates have been intensively studied. Here the authors use resonant inelastic x-ray scattering and theoretical calculations to study magnons in thin films of SrCuO2, finding distinct magnon dispersion attributed to renormalization due to quantum fluctuations.
- Subjects
MAGNONS; QUANTUM fluctuations; CUPRATES; X-ray scattering; QUANTUM phase transitions; HUBBARD model; INELASTIC scattering; THIN films
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49714-y