Spin-orbit coupling in the Mott insulator Ca2RuO4

Spin-orbit coupling in the Mott insulator Ca2RuO4

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 R...

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Veröffentlicht in:Physical review letters 2001-08, Vol.8707 (7)
Hauptverfasser: Mizokawa, T., Tjeng, L. H., Sawatzky, G. A., Ghiringhelli, G., Tjernberg, Oscar, Brookes, N. B., Fukazawa, H., Nakatsuji, S., Maeno, Y.
Format: Artikel
Sprache:eng
Schlagworte:
ca2-xsrxruo4
electronic-structure
layered perovskite
sr2ruo4
states
superconductivity
transition
triplet
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.077202