Abstract
On the basis of both the inhomogeneity of a superconductor Bi 2Sr 2CaCu 2O 8+ δ and the effect of measurement, we reveal that an anomalously large gap anisotropy known as evidence of d x 2 - y 2 -wave symmetry [Z.X. Shen, D.S. Dessau, B.O. Wells, D.M. King, W.E. Spicer, A.J. Arko, D. Marshall, L.W. Lombardo, A. Kapitulnik, P. Dickinson, S. Doniach, J. DiCarlo, A.G. Loeser, C.H. Park, Phys. Rev. Lett. 70 (1993) 1553] is not intrinsic, and that the constant Fermi velocity at the node as an unsolved problem [X.J. Zhou, T. Yoshida, A. Lanzara, P.V. Bogdanov, S.A. Kellar, K.M. Shen, W.L. Yang, F. Ronning, T. Sasagawa, T. Kakeshita, T. Noda, H. Eisaki, S. Uchida, C.T. Lin, F. Zhou, J.W. Xiong, W.X. Ti, Z.X. Zhao, A. Fujimori, Z. Hussain, Z.-X. Shen, Nature 423 (2003) 398] is due to the d x 2 - y 2 -wave insulator–metal transition.
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