Breakpoint in the evolution of the gap through the cuprate phase diagram

W. Guyard, M. Le Tacon, M. Cazayous, A. Sacuto, A. Georges, D. Colson, and A. Forget
Phys. Rev. B 77, 024524 – Published 28 January 2008

Abstract

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.

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  • Received 31 August 2007

DOI:https://doi.org/10.1103/PhysRevB.77.024524

©2008 American Physical Society

Authors & Affiliations

W. Guyard, M. Le Tacon, M. Cazayous, and A. Sacuto

  • Laboratoire Matériaux et Phénoménes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, Batiment Condorcet, 10 rue Alice Domon et Lonie Duquet, 75205 Paris, France and Laboratoire de Physique du Solide, ESPCI, 10 rue Vauquelin, 75231 Paris, France

A. Georges

  • Centre de Physique Théorique, Ecole Polytechnique, 91128 Palaiseau Cedex, France

D. Colson and A. Forget

  • Service de Physique de l’Etat Condensé, CEA-Saclay, 91191 Gif-sur-Yvette, France

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Issue

Vol. 77, Iss. 2 — 1 January 2008

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