Frequency-dependent thermal response of the charge system and restricted sum rules in La2-xSrxCuO4

被引：57

作者：

Ortolani, M

Calvani, P

Lupi, S

机构：

[1] Univ Roma La Sapienza, Coherentia INFM, I-00185 Rome, Italy

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.94.067002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In La2-xSrxCuO4 ( LSCO) the spectral weight W = integral(0)(Omega)sigma(1)(ab)(omega,T)domega [where sigma(1)(ab)(omega,T) is the ab-plane conductivity] obeys the same law W = W-0 - B(Omega)T-2 as in a conventional metal such as gold, for any Omega up to the plasma edge. However, in LSCO B(Omega) points toward correlation effects and, unlike in gold, is related to an energy scale t(T) much less than t(0) similar to W-0. The Ferrell-Glover-Tinkham sum rule is fulfilled in LSCO superconductors for Omega greater than or similar to 2000 cm(-1).

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