2007/08/28 by William Guyard, W. Guyard, M. Le Tacon +6
Chemistry · Engineering · Physics and Astronomy · #Advanced Condensed Matter Physics #Breakpoint #Chemistry #Condensed matter physics #Cuprate #Doping #High-temperature superconductivity #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Raman scattering #Raman spectroscopy #Scattering #Superconducting Materials and Applications #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.024524
published as Phys. Rev. B, 77 024524 (2008)
arxiv created 2007/08/28 · openalex publication_date 2008/01/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The actual physical origin of the gap at the antinodes and a clear identification of the superconducting gap are fundamental open issues in the physics of high-Tc superconductors. Here, we present a systematic electronic Raman scattering study of a mercury-based single layer cuprate as a function of both doping level and temperature. On the deeply overdoped side, we show that the antinodal gap is a true superconducting gap. In contrast, on the underdoped side, our results reveal the existence of a breakpoint close to optimal doping, below which the antinodal gap is gradually disconnected from superconductivity. The nature of both the superconducting and normal states is distinctly different on each side of this breakpoint.