Spin-Orbit Coupling in the Mott Insulator Ca2RuO4

Mizokawa, T.; Tjeng, L. H.; Sawatzky, G. A.; Ghiringhelli, G.; Tjernberg, O.; Brookes, N. B.; Fukazawa, H.; Nakatsuji, S.; Maeno, Y.

doi:10.1103/PhysRevLett.87.077202

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Spin-Orbit Coupling in the Mott Insulator Ca₂RuO₄

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Mizokawa, T., Tjeng, L. H., Sawatzky, G. A., Ghiringhelli, G., Tjernberg, O., Brookes, N. B., et al. (2001). Spin-Orbit Coupling in the Mott Insulator Ca₂RuO₄. Physical Review Letters, 87(7): 077202, pp. 1-4. doi:10.1103/PhysRevLett.87.077202.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1E96-7

Abstract

O 1s x-ray absorption study of the Mott insulator Ca2RuO4 shows that the orbital population of the 4d t(2g) band dramatically changes with temperature. In addition, spin-resolved circularly polarized photoemission study of Ca2RuO4 shows that a substantial orbital angular momentum is induced in the Ru 4d t(2g) band. Based on the experimental results and model Hartree-Fock calculations, we argue that the cooperation between the strong spin-orbit coupling in the Ru 4d t(2g) band and the small distortion of the RuO6 octahedra causes the interesting changeover of the spin and orbital anisotropy as a function of temperature.