Two Pseudogaps in the Cuprates

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Figure 1

Doping dependence of $T_c$ (solid line) and superconducting fluctuations in Bi2212 (open [8] and solid diamonds [7]), YBCO (solid [9] and open squares [1]), Bi2201 (stars) [10], and LSCO (open circles) [11]. Dotted line: leading-edge pseudogap from photoemission [4] (arrows indicate that temperatures are only lower limits); thick dashed line: weak pseudogap temperature $T^{*}$ in YBCO [3]; solid circles: $\Delta /3$, where $\Delta$ is the peak position measured in tunneling [5]. Inset: triangles: two gaps found in interlayer tunneling [12].