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Nature of the Electronic Excitations near the Brillouin Zone Boundary of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$

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arxiv cond-mat/0107073 v1 pith:KVWUFKJ3 submitted 2001-07-04 cond-mat.supr-con cond-mat.str-el

D. L. Feng , C. Kim , H. Eisaki , D. H. Lu , K. M. Shen , F. Ronning , N. P. Armitage , A. Damascelli
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N. Kaneko M. Greven J.-i. Shimoyama K. Kishio R. Yoshizaki G. D. Gu Z.-X.Shen
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classification cond-mat.supr-concond-mat.str-el
keywords cacudeltadifferentelectronicnearregionadditionalanalysis
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abstract

Based on angle resolved photoemission spectra measured on different systems at different dopings, momenta and photon energies, we show that the anomalously large spectral linewidth in the $(\pi,0)$ region of optimal doped and underdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ has significant contributions from the bilayer splitting, and that the scattering rate in this region is considerably smaller than previously estimated. This new picture of the electronic excitation near $(\pi,0)$ puts additional experimental constraints on various microscopic theories and data analysis.

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