Spin-orbit coupling in the Mott insulator Ca(2)RuO(4) |
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| Authors: | Mizokawa T Tjeng L H Sawatzky G A Ghiringhelli G Tjernberg O Brookes N B Fukazawa H Nakatsuji S Maeno Y |
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| Institution: | Department of Complexity Science and Engineering, University of Tokyo, Tokyo 113-0033, Japan. |
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| Abstract: | O 1s x-ray absorption study of the Mott insulator Ca(2)RuO(4) shows that the orbital population of the 4d t(2g) band dramatically changes with temperature. In addition, spin-resolved circularly polarized photoemission study of Ca(2)RuO(4) 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 RuO(6) octahedra causes the interesting changeover of the spin and orbital anisotropy as a function of temperature. |
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