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From the following article:

Abrupt onset of a second energy gap at the superconducting transition of underdoped Bi2212

W. S. Lee, I. M. Vishik, K. Tanaka, D. H. Lu, T. Sasagawa, N. Nagaosa, T. P. Devereaux, Z. Hussain & Z.-X. Shen

Nature 450, 81-84(1 November 2007)

doi:10.1038/nature06219

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 1

Temperature and momentum dependence of the low energy excitations in slightly underdoped Bi2212 (Tc = 92 K).

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Figure 2

Detailed temperature dependence of the superconducting gap near the nodal region of underdoped Bi2212 (Tc = 92 K) measured under two different experimental configurations.

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Figure 3

Temperature dependence of the gap profile.

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Figure 4

Schematic illustrations of the gap function evolution for three different doping levels.

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