Pairing in cuprates from high energy electronic states

Details Pairing in cuprates from high energy electronic states Pairing in cuprates from high energy electronic states

2001-11-28

arxiv.org/abs/cond-mat/0111539v1

Europhysics Letters 62, 568-574 (2003)

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures

Scientific paper

10.1209/epl/i2003-00388-9

The in-plane optical conductivity of Bi2Sr2CaCu2O8+d thin films with small carrier density (underdoped) up to large carrier density (overdoped) is analyzed with unprecedented accuracy. Integrating the conductivity up to increasingly higher energies points to the energy scale involved when the superfluid condensate builds up. In the underdoped sample, states extending up to 2 eV contribute to the superfluid. This anomalously large energy scale may be assigned to a change of in-plane kinetic energy at the superconducting transition, and is compatible with an electronic pairing mechanism.

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