Complete d-band dispersion relation in sodium cobaltates

被引：63

作者：

Qian, D. ^{[1
]}

Wray, L.

Hsieh, D.

Viciu, L.

Cava, R. J.

Luo, J. L.

Wu, D.

Wang, N. L.

Hasan, M. Z.

机构：

[1] Princeton Univ, Joseph Henry Labs, Dept Phys, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[3] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.97.186405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the complete d-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brillouin zone corner and the full quasiparticle band is found to emerge as a many-body entity lacking a pure orbital polarization. At low dopings, the quasiparticle bandwidth (Fermion scale, many-body E-F similar to 0.25 eV) is found to be smaller than most known oxide metals. The low-lying density of states is found to be in agreement with bulk-sensitive thermodynamic measurements for nonmagnetic dopings where the 2D Luttinger theorem is also observed to be satisfied.

引用

页数：4

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