科研之友
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摘要
We report an angular resolved photoemission study of NaxCoO2 with x similar or equal to 0.73 where it is found that the renormalization of the quasiparticle (QP) dispersion changes dramatically upon a rotation from Gamma M to Gamma K. The comparison of the experimental data to the calculated band structure reveals that the quasiparticle renormalization is most pronounced along the Gamma K direction, while it is significantly weaker along the Gamma M direction. We discuss the observed anisotropy in terms of multiorbital effects and point out the relevance of magnetic correlations for the band structure of NaxCoO2 with x similar or equal to 0.75.
- 出版日期2007-7-27
