Spin-orbit coupling in the Mott insulator Ca2RuO4 - art. no. 077202

Authors
Mizokawa, T Tjeng, LH Sawatzky, GA Ghiringhelli, G Tjernberg, O Brookes, NB Fukazawa, H Nakatsuji, S Maeno, Y
Citation
T. Mizokawa et al., Spin-orbit coupling in the Mott insulator Ca2RuO4 - art. no. 077202, PHYS REV L, 8707(7), 2001, pp. 7202
Citations number
27
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8707
Issue
7
Year of publication
2001
Database
ISI
SICI code
0031-9007(20010813)8707:7<7202:SCITMI>2.0.ZU;2-V
Abstract
O 1s x-ray absorption study of the Mott insulator Ca2RuO4 shows that the or bital population of the 4d t(2g) band dramatically changes with temperature . In addition, spin-resolved circularly polarized photoemission study of Ca 2RuO4 shows that a substantial orbital angular momentum is induced in the R u 4d t(2g) band. Based on the experimental results and model Hartree-Fock c alculations, we argue that the cooperation between the strong spin-orbit co upling in the Ru 4d t(2g) band and the small distortion of the RuO6 octahed ra causes the interesting changeover of the spin and orbital anisotropy as a function of temperature.