期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 67, 期 1-3, 页码 239-243出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2005.10.129
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A detailed study of the normal state photoemission lineshapes and quasiparticle dispersion for the single layer Bi2Sr2-xLaxCuO6+delta (Bi2201) superconductor is presented. We report the first experimental evidence of a double peak structure and a dip of spectral intensity in the energy distribution curves (EDCs) along the nodal direction. The double peak structure is well identified in the normal state, up to 10 times the critical temperature. As a result of the same self-energy effect, a strong mass renormalization of the quasiparticle dispersion, i.e. kink, and an increase of the quasiparticle lifetime in the normal state are also observed. Our results provide unambiguous evidence on the existence of bosonic excitation in the normal state, and support a picture where nodal quasiparticles are strongly coupled to the lattice. (c) 2005 Published by Elsevier Ltd.
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