Abstract
A very general Hamiltonian which describes the coupling of charge carriers via a spin susceptibility is used to derive a formula for the free energy difference between the superconducting and the normal state of a d-wave superconductor. The formula is then specialized to the nearly antiferromagnetic Fermi liquid (NAFL) model and evaluated numerically. The comparison with specific heat data measured for optimally doped YBa2Cu3O6.95 reveals the necessity to include even contributions far away from the Fermi surface to the free energy. The usual restriction to a narrow shell around the Fermi surface in deriving the free energy formula is proved to be inadequate.
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Muhrer, G., Schachinger, E. Free Energy of a d-Wave Superconductor in the Nearly Antiferromagnetic Fermi Liquid Model. Journal of Low Temperature Physics 120, 65–88 (2000). https://doi.org/10.1023/A:1004608902912
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DOI: https://doi.org/10.1023/A:1004608902912