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Orbitally Driven Spin-Singlet Dimerization in S=1 La4Ru2O10

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Wu, H., Hu, Z., Burnus, T., Denlinger, J. D., Khalifah, P. G., Mandrus, D. G., et al. (2006). Orbitally Driven Spin-Singlet Dimerization in S=1 La4Ru2O10. Physical Review Letters, 96(25): 256402, pp. 1-4. doi:10.1103/PhysRevLett.96.256402.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-180A-F
Using x-ray absorption spectroscopy at the Ru-L-2,L-3 edge we reveal that the Ru4+ ions remain in the S=1 spin state across the rare 4d-orbital ordering transition and spin-gap formation. We find using local spin density approximation+Hubbard U band structure calculations that the crystal fields in the low-temperature phase are not strong enough to stabilize the S=0 state. Instead, we identify a distinct orbital ordering with a significant anisotropy of the antiferromagnetic exchange couplings. We conclude that La4Ru2O10 appears to be a novel material in which the orbital physics drives the formation of spin-singlet dimers in a quasi-two-dimensional S=1 system.