Optical experiments by Molegraaf et al reveal that the superconducting
condensation energy of Bi_2Sr_2CaCu_2O_{8+\delta} originates in lowering of
kinetic energy of the carriers. A perspective on the significance of these
results is given.Comment: Perspective on paper "Superconductivity-induced Transfer of In-plane
  Spectral Weight in Bi_2Sr_2CaCu_2O_{8+\delta}", by H.J.A. Molegraaf et al,
  Science Vol. 295, p. 2239 (2002

Hirsch, J. E.

English

arXiv

lower T lower T kinetic energy driven pairing potential energy driven pairing spectral weight transfer σ1(ω) ω Two routes to pairing and superconductivity. In the conventional route (upper right), carriers lower their potential energy upon pairing. In the new route (lower left), carriers lower their kinetic energy upon pairing, they become lighter and can propagate more easily. In both cases optical spectral weight at low frequencies is rearranged due to the opening of the superconducting energy gap. Only in the latter case is optical spectral weight transfered from the high frequency visible region to the low frequency region. color change normal superconducting normal stat

The True Colors of Cuprates

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