Temperature-induced spectral weight transfer in Bi2Sr2CaCu2O8+delta: a conventional view
J. C. Campuzano, H. Ding, H. Fretwell, J. Mesot, A. Kaminski, T. Yokoya, T. Takahashi, T. Mochiku, K. Kadowaki
Abstract
In contrast with the recent photoemission observations by Shen et al. of anomalous temperature-induced momentum-dependent spectral weight transfer in Bi2Sr2CaCu2O8+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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