In-plane optical spectral weight transfer in optimally doped Bi2Sr2Ca2Cu3O10

被引：28

作者：

Carbone, F. ^{[1
]}

Kuzmenko, A. B. ^{[1
]}

Molegraaf, H. J. A. ^{[1
]}

van Heumen, E. ^{[1
]}

Giannini, E. ^{[1
]}

van der Marel, D. ^{[1
]}

机构：

[1] Univ Geneva, DPMC, Geneva 4, Switzerland

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.74.024502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We examine the redistribution of the in-plane optical spectral weight in the normal and superconducting state in trilayer Bi2Sr2Ca2Cu3O10 (Bi2223) near optimal doping (T-c=110 K) on a single crystal via infrared reflectivity and spectroscopic ellipsometry. We report the temperature dependence of the low-frequency integrated spectral weight W(Omega(c)) for different values of the cutoff energy Omega(c). Two different model-independent analyses consistently show that for Omega(c)=1 eV, which is below the charge transfer gap, W(Omega(c)) increases below T-c, implying the lowering of the kinetic energy of the holes. This is opposite to the BCS scenario, but it follows the same trend observed in the bilayer compound Bi2Sr2CaCu2O8 (Bi2212). The size of this effect is larger in Bi2223 than in Bi2212, approximately scaling with the critical temperature. In the normal state, the temperature dependence of W(Omega(c)) is close to T-2 up to 300 K. (c) 2006 American Institute of Physics.

引用

页数：10

共 36 条

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