2008/04/14 by J. Hwang, Jungseek Hwang, J. P. Carbotte +2
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.100.177005
published as Phys. Rev. Lett. 100, 177005 (2008) · 4 pages, 3 figures. To appear in Phys. Rev. Lett
arxiv created 2008/04/14 · openalex publication_date 2008/05/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The real part of the in-plane optical self-energy data in underdoped Bi2Sr2CaCu2O8+delta (Bi-2212) and ortho II YBa2Cu3O6.5 contains new and important information on the pseudogap. Using a theoretical model approach, a major new finding is that states lost below the pseudogap Deltapg are accompanied by a pileup of states just above this energy. The pileup along with a sharp mode in the bosonic spectral function leads to an unusually rapid increase in the optical scattering rate as a function of frequency and a characteristically sloped peak in the real part of the optical self-energy. These features are not found in optimally doped and overdoped samples and represent the clearest signature so far in the in-plane optical conductivity of the opening of a pseudogap.