Figure 2.

Doping dependences of superconducting gap parameters. (a) Nodal gap energy 2ΔN (blue circles) and antinodal gap energy 2Δ (red squares) [8]. The solid curve denotes an energy of 8.5kBTc. (b) Square of nodal-to-antinodal gap ratio (ΔN)2 determined from ARPES [8]. (c) Superfluid density ρs determined from magnetic penetration depth (triangles) [21] and from heat capacity (crosses) [22]. (d) Superconducting gap profiles normalized to the antinodal gap for underdoped and optimally doped samples with Tc = 42, 66, and 91 K (UD42, UD66, and OP91, respectively). (e) Correlation between 2ΔN/kBTc and 2Δ/kBTc ratios. The insets illustrate the occurrence of incoherent electron pairs in strong coupling superconductivity.

Ino et al. Nanoscale Research Letters 2013 8:515   doi:10.1186/1556-276X-8-515
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