Condensation Energy and Spectral Functions in High Temperature Superconductors

Abstract

If high temperature cuprate superconductivity is due to electronic correlations, then the energy difference between the normal and superconducting states can be expressed in terms of the occupied part of the single particle spectral function. The latter can, in principle, be determined from angle resolved photoemission (ARPES) data. As a consequence, the energy gain driving the development of the superconducting state is intimately related to the dramatic changes in the photoemission lineshape when going below Tc. These points are illustrated in the context of the "mode" model used to fit ARPES data in the normal and superconducting states, where the question of kinetic energy versus potential energy driven superconductivity is explored in detail. We use our findings to comment on the relation of ARPES data to the condensation energy, and to various other experimental data. In particular, our results suggest that the nature of the superconducting transition is strongly related to how anomalous (non Fermi liquid like) the normal state spectral function is, and as such, is dependent upon the doping level.

10 pages, revtex, 4 encapsulated postscript figures

References in corpus (5)

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• The Magnetic Excitation Spectrum and Thermodynamics of High-$T_c$ Superconductors
• Quasiparticles in the superconducting state of Bi2Sr2CaCu2O8
• Importance of matrix elements in the ARPES spectra of BISCO
• Quantum fluctuations and the c-axis optical conductivity of High-T_c Superconductors

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