Gaplike excitations in the superconducting state of Bi2Sr2CaCu2O8 studied by resonant raman scattering -: art. no. 057003

被引：7

作者：

Budelmann, D ^{[1
]}

Schulz, B

Rübhausen, M

Klein, MV

Williamsen, MS

Guptasarma, P

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany

[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[3] Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.95.057003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the response of the electronic continuum from inelastic light-scattering experiments over an extended energy range between 1.970 and 4.504 eV in the superconducting state of Bi2Sr2CaCu2O8. The formation of a substantial Raman feature at shifts below twice the superconducting gap as well as the additional weight above this energy are found to be strongly dependent on the incident photon energy. For excitation wavelengths observed in ultraviolet, we find an enhancement of the integrated spectral weight below T-c. The resulting composite feature shows three distinct resonances at 2.5, 3.3, and 3.8 eV. We strongly suggest that the superconductivity-induced changes are the result of both the opening of a superconducting gap and the appearance of a collective mode.

引用

页数：4

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