Orbital polarization in layered t2g electron systems

Details Orbital polarization in layered t2g electron systems Orbital polarization in layered t2g electron systems

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..169m&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 169 (2004).

Physics

7

Scientific paper

By means of x-ray absorption spectroscopy and model Hartree Fock calculations, we have investigated the electronic structure of layered t2g electron systems such as Ca2-xSrxRuO4 and Bi2Sr2Co2O9. For the hole-doped Co O triangular lattice in Bi2Sr2Co2O9, the x-ray absorption spectral line shape indicates that the carriers in the t2g band mainly have the a1g symmetry. This result is supported by model Hartee Fock calculations on the CoO2 lattice model. In Ca2-xSrxRuO4, the interplay between the orbital ordering and the Mott transition is demonstrated by the x-ray absorption measurement. It is shown that the orbital ordering accompanied by the lattice distortion is important in describing the insulating state of Ca2-xSrxRuO4. This idea is also supported by model Hartee Fock calculations on the RuO2 lattice model.

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