Pairing in cuprates from high-energy electronic states

被引：107

作者：

Santander-Syro, AF

Lobo, RPSM

Bontemps, N

Konstantinovic, Z

Li, ZZ

Raffy, H

机构：

[1] Ecole Super Phys & Chim Ind Ville Paris, Lab Phys Solide, CNRS, UPR 5, F-75231 Paris 5, France

[2] Univ Paris 11, Phys Solides Lab, CNRS, UMR 8502, F-91405 Orsay, France

来源：

EUROPHYSICS LETTERS | 2003年 / 62卷 / 04期

关键词：

D O I：

10.1209/epl/i2003-00388-9

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The in-plane optical conductivity of Bi2Sr2CaCu2O8+delta films with small carrier density (underdoped) up to large carrier density (overdoped) is derived from accurate reflectivity data. Integrating the conductivity up to increasingly higher frequencies yields the energy scale involved in the formation of the condensate. At least in the underdoped sample, states extending up to 2 eV contribute to the superfluid. This anomalously large energy scale may be assigned to a change of in-plane kinetic energy at the superconducting transition, and is compatible with an electronic pairing mechanism.

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页码：568 / 574

页数：7

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