Abrupt Onset of Second Energy Gap at Superconducting Transition along the Fermi Arc of Underdoped Bi2212
Author List: W.S. Lee, K. Tanaka, D.H. Lu, T. Sasagawa, N. Nagaosa, T.P. Devereaux, Z. Hussain, and Z.X. Shen
Journal Reference: Nature, 450, 81 (2007).