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Doubling of the bands in overdoped Bi2Sr2CaCu2O8-probable evidence for c-axis bilayer coupling

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arxiv cond-mat/0102386 v1 pith:YC6HNRD7 submitted 2001-02-21 cond-mat.supr-con cond-mat.str-el

Y.-D. Chuang , A.D. Gromko , A. Fedorov , D.S. Dessau , Y. Aiura , K. Oka , Yoichi Ando , H. Eisaki
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S.I. Uchida
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classification cond-mat.supr-concond-mat.str-el
keywords splittingbilayernearbandsdoublingalongapproachesapproximately
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We present high resolution ARPES data of the bilayer superconductor Bi2Sr2CaCu2O8 (Bi2212) showing a clear doubling of the near EF bands. This splitting approaches zero along the (0,0)-(pi,pi) nodal line and is not observed in single layer Bi2Sr2CuO6 (Bi2201), suggesting that the splitting is due to the long sought after bilayer splitting effect. The splitting has a magnitude of approximately 75 meV near the middle of the zone, extrapolating to about 100 meV near the (pi,0) point

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