1997/11/21 by G. Blumberg, M. Kang, Moonsoo Kang +5 · 5 citations
Engineering · Physics and Astronomy · #Magnetic confinement fusion research #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1126/science.278.5342.1427
published as SCIENCE, vol. 278, pp. 1427-1432 (21 November 1997) · 6 pages, 4 color figures, PDF format
arxiv created 1997/11/21 · openalex publication_date 1997/11/21 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Electronic Raman scattering from high- and low-energy excitations was studied as a function of temperature, extent of hole doping, and energy of the incident photons in Bi2Sr2CaCu2O8+/-delta superconductors. For underdoped superconductors, short-range antiferromagnetic (AF) correlations were found to persist with hole doping, and doped single holes were found to be incoherent in the AF environment. Above the superconducting (SC) transition temperature Tc, the system exhibited a sharp Raman resonance of B1g symmetry and energy of 75 millielectron-volts and a pseudogap for electron-hole excitations below 75 millielectron-volts, a manifestation of a partially coherent state forming from doped incoherent quasi particles. The occupancy of the coherent state increases with cooling until phase ordering at Tc produces a global SC state.