Phase-fluctuation induced reduction of the kinetic energy at the superconducting transition

Details Phase-fluctuation induced reduction of the kinetic energy at the superconducting transition Phase-fluctuation induced reduction of the kinetic energy at the superconducting transition

2002-07-17

arxiv.org/abs/cond-mat/0207425v3

Phys. Rev. B 68, 014505 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 3 eps-figures

Scientific paper

10.1103/PhysRevB.68.014505

Recent reflectivity measurements provide evidence for a "violation" of the in-plane optical integral in the underdoped high-T_c compound Bi_2Sr_2CaCu_2O_{8+\delta} up to frequencies much higher than expected by standard BCS theory. The sum rule violation may be related to a loss of in-plane kinetic energy at the superconducting transition. Here, we show that a model based on phase fluctuations of the superconducting order parameter can account for this change of in-plane kinetic energy at T_c. The change is due to a transition from a phase-incoherent Cooper-pair motion in the pseudogap regime above T_c to a phase-coherent motion at T_c.

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