Spin-orbit coupling in the mott insulator Ca2RuO4

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

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4 Citations (Scopus)


O 1s x-ray absorption study of the Mott insulator Ca2RuO4 shows that the orbital population of the 4d t2g 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 t2g 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 t2g band and the small distortion of the RuO6 octahedra causes the interesting changeover of the spin and orbital anisotropy as a function of temperature.

Original languageEnglish
Pages (from-to)77202-1-77202-4
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 2001 Aug 13
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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