Evolution of the gaps through the cuprate phase-diagram

Details Evolution of the gaps through the cuprate phase-diagram Evolution of the gaps through the cuprate phase-diagram

2007-08-28

arxiv.org/abs/0708.3732v1

Phys. Rev. B, 77 024524 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.77.024524

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-$T_c$ 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 break point close to optimal doping below which the antinodal gap is gradually disconnected from superconductivity. The nature of both the superconducting and normal state is distinctly different on each side of this breakpoint.

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