Fermi surface and quasiparticle dynamics of Na0.7CoO2 investigated by angle-resolved photoemission spectroscopy -: art. no. 246402

被引：210

作者：

Hasan, MZ ^{[1
]}

Chuang, YD

Qian, D

Li, YW

Kong, Y

Kuprin, A

Fedorov, AV

Kimmerling, R

Rotenberg, E

Rossnagel, K

Hussain, Z

Koh, H

Rogado, NS

Foo, ML

Cava, RJ

机构：

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

[2] Princeton Mat Inst, Princeton Ctr Complex Mat, Princeton, NJ 08544 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.92.246402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first angle-resolved photoemission study of Na0.7CoO2, the host material of the superconducting NaxCoO2.nH(2)O series. Our results show a hole-type Fermi surface, a strongly renormalized quasiparticle band, a small Fermi velocity, and a large Hubbard U. The quasiparticle band crosses the Fermi level from M toward Gamma suggesting a negative sign of effective single-particle hopping t(eff) (about 10 meV) which is on the order of magnetic exchange coupling J in this system. Quasiparticles are well defined only in the T-linear resistivity (non-Fermi-liquid) regime. Unusually small single-particle hopping and unconventional quasiparticle dynamics may have implications for understanding the phase of matter realized in this new class of a strongly interacting quantum system.

引用

页码：246402 / 1

页数：4

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