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 SrCuO, 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 LaCuO indicate that quantum fluctuations are much stronger in SrCuO 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 SrCuO-due to strong quantum fluctuations-is a unique starting point for the exploration of novel magnetic ground states.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11196644 | PMC |
| http://dx.doi.org/10.1038/s41467-024-49714-y | DOI Listing |
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