期刊
PHYSICAL REVIEW B
卷 78, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.174522
关键词
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资金
- MCyT [FIS2005-05478-C02-01]
- Ramon y Cajal
- Consejeria de Educacion de la CAM
- CSIC [CG07-CSIC/ESP-2323]
- I3P
Recent experiments in underdoped hole-doped cuprates have shown the presence of two energy scales in the Raman spectrum in the superconducting state. This feature has a natural explanation in some models in which pseudogap and superconductivity compete. In electron-doped cuprates antiferromagnetic correlations are believed to survive in the superconducting state and are believed to produce a pseudogap above the critical temperature. Contrary to hole-doped systems, in electron-doped compounds only one energy scale appears since the pair-breaking Raman intensity peaks in both B-1g (antinodal) and B-2g (nodal) channels at a frequency of a few meV, typical of the superconducting order parameter. In this paper we analyze the different effects in the Raman spectrum of the competition between pseudogap and superconductivity in electron- and hole-doped cuprates. The difference in energy scales in both systems is explained in terms of the different truncation of the Fermi surface induced by the pseudogap. For electron-doped cuprates we also analyze the spectrum with antiferromagnetism and a nonmonotonic superconducting order parameter.
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