Figure 13. Structures in LSCO correlation length.

(a) SDOS for undoped LSCO at several temperatures; light-blue dotted line gives OZ form of SDOS. (b) Corresponding temperature dependence of correlation length ξ_th. For x = 0, the red solid line with filled dots is ξ_th calculated from the solid lines in (a), while the thin green dot-dashed line is based on the dashed lines in (a), showing that ξ_th is relatively insensitive to the structures away from threshold. In contrast, the blue dashed line is based on the shape of the SDOS at T = 2000 K, but shifted and renormalized to match the SDOS at lower T, illustrating sensitivity to the leading edge structure. The black dotted line illustrates the scaling ξ_th ∝ T^−1/2. (c) Calculated ξ_th replotted for x = 0 (red solid line with filled circles) compared with ξ_1/2 (blue filled circles) and with experiment (green dot-dot-dashed line)⁵⁸; the blue dotted line is twice ξ_th.