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Temperature-induced spectral weight transfer in Bi_2Sr_2CaCu_2O_{8+delta}: a conventional view

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arxiv cond-mat/9811349 v1 pith:TM6PFCVG submitted 1998-11-25 cond-mat.supr-con cond-mat.str-el

J. C. Campuzano , H. Ding , H. Fretwell , J. Mesot , A. Kaminski , T. Yokoya , T. Takahashi , T. Mochiku
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K. Kadowaki
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classification cond-mat.supr-concond-mat.str-el
keywords spectralweightcacudeltaintegratedphotoemissiontemperature-inducedtransfer
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In contrast with the recent photoemission observations by Shen et al. of anomalous temperature-induced momentum-dependent spectral weight transfer in Bi_2Sr_2CaCu_2O_{8+delta}, we find that in the same material, in spite of the unusual spectral lineshape change between superconducting and normal states, the integrated spectral weight displays minimum variation as a function of temperature, which is in agreement with the sum rule of angle-resolved photoemission: the integrated spectral weight is proportional to the momentum density, n(k).

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