Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8

被引：31

作者：

Hussey, NE

Nakamae, S

Behnia, K

Takagi, H

Urano, C

Adachi, S

Tajima, S

机构：

[1] Loughborough Univ Technol, Dept Phys, Loughborough LE11 3TU, Leics, England

[2] ESPCI, CNRS, UPR 5, F-75005 Paris, France

[3] Univ Tokyo, Grad Sch Frontier Sci, Dept Adv Mat Sci, Tokyo 1138656, Japan

[4] Int Superconduct Technol Ctr, Superconducting Res Lab, Tokyo 135, Japan

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.85.4140

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the in-plane thermal conductivity kappa of the stoichiometric underdoped cuprate YBa2Cu4O8 (Y124) below 1 K. kappa>(*) over bar * (T) is shown to follow a simple phononic T-3 dependence at the lowest temperature T for both current directions, with a negligible linear quasiparticle contribution. This observation is in marked contrast with behavior reported in optimally doped cuprates, and implies that extended zero-energy (or low-energy) quasiparticles are absent in Y124.

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页码：4140 / 4143

页数：4

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