Giant electron-electron scattering in the Fermi-liquid state of Na0.7CoO2 -: art. no. 056401

被引：121

作者：

Li, SY ^{[1
]}

Taillefer, L

Hawthorn, DG

Tanatar, MA

Paglione, J

Sutherland, M

Hill, RW

Wang, CH

Chen, XH

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Toronto, Dept Phys, Toronto, ON, Canada

[3] Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Anhui, Peoples R China

[4] NAS Ukraine, Inst Surface Chem, Kiev, Ukraine

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.056401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The in-plane resistivity rho and thermal conductivity kappa of single crystal Na0.7CoO2 were measured down to 40 mK. Verification of the Wiedemann-Franz law, kappa/T=L-0/rho as T-->0, and observation of a T-2 dependence of rho at low temperature establish the existence of a well-defined Fermi-liquid state. The measured value of coefficient A reveals enormous electron-electron scattering, characterized by the largest Kadowaki-Woods ratio A/gamma(2) encountered in any material. The rapid suppression of A with magnetic field suggests a possible proximity to a magnetic quantum critical point. We also speculate on the possible role of magnetic frustration and proximity to a Mott insulator.

引用

页码：056401 / 1

页数：4

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