Anomalous quasiparticle renormalization in Na0.73CoO2:: Role of interorbital interactions and magnetic correlations

被引：31

作者：

Geck, J.

Borisenko, S. V.

Berger, H.

Eschrig, H.

Fink, J.

Knupfer, M.

Koepernik, K.

Koitzsch, A.

Kordyuk, A. A.

Zabolotnyy, V. B.

Buechner, B.

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[3] Ecole Polytech Fed Lausanne, Inst Phys Mat Complex, CH-1015 Lausanne, Switzerland

[4] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.99.046403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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.

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页数：4

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