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Quasiparticles in the superconducting state of Bi2Sr2CaCu2O8

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arxiv cond-mat/9904390 v2 pith:YAIO5UBQ submitted 1999-04-27 cond-mat.supr-con

A. Kaminski , J. Mesot , H. Fretwell , J. C. Campuzano , M. R. Norman , M. Randeria , H. Ding , T. Sato
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T. Takahashi T. Mochiku K. Kadowaki H. Hoechst
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classification cond-mat.supr-con
keywords momentumstatesuperconductingbi2sr2cacu2o8quasiparticlesresolutionresultsalong
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Recent improvements in momentum resolution by a factor of 32 lead to qualitatively new ARPES results on the spectra of Bi2Sr2CaCu2O8 (Bi2212) along the (pi,pi) direction, where there is a node in the superconducting gap. With improved resolution, we now see the intrinsic lineshape, which indicates the presence of true quasiparticles at the Fermi momentum in the superconducting state, and lack thereof in the normal state. The region of momentum space probed here is relevant for charge transport, motivating a comparison of our results to conductivity measurements by infrared reflectivity.

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