Loss of antinodal coherence with a single d-wave superconducting gap leads to two energy scales for underdoped cuprate superconductors
S. Blanc, Y. Gallais, M. Cazayous, M. A. Méasson, A. Sacuto, A. Georges, J. S. Wen, Z. J. Xu, G. D. Gu, D. Colson
DOI 10.1103/PhysRevB.82.144516 · Physical Review B
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Abstract
We address the question of the two energy scales in the superconducting state of hole-doped copper-oxide superconductors below the optimal doping level. We show by performing temperature-dependent Raman scattering measurements on Bi2Sr2CaCu2O8+δ that the two energy scales often assigned to two distinct gaps, are both associated with coherent Bogoliubov quasiparticles and can be simply explained by a one single d-wave gap and the loss of antinodal coherence. We then establish that the critical temperature Tc is controlled by the fraction of coherent Fermi surface fc around the nodes such as: kBTc∝fc⋅Δmax, where Δmax is the maximum amplitude of the superconducting gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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