2008/06/30 by B. Valenzuela, E. Bascones
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Cuprate #Doping #Electron #Fermi surface #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Raman spectroscopy #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.174522
published as Phys. Rev. B 78, 174522 (2008) · 7 pages, 4 postscript figures, minor changes in the text, Fig. 3 and Fig. 4 replaced to better visualize them
openalex publication_date 2008/11/21 · arxiv created 2008/11/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 B1g (antinodal) and B2g (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.