Strong- versus Weak-Coupling Paradigms for Cuprate Superconductivity
Abstract
Absolute resistivity measurements as a function of temperature from optimally doped YBa2Cu3O(7), La(2-x)SrxCuO4, Bi2Sr2CaCu2O(8-x), and (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oy thin films are reported. Special attention is given to the measurement geometrical factors and the resistivity slope between Tc and T*. The results are compared with a strong coupling theory for the resistivity derivative near Tc, which is based on hard core bosons (HCB), and with several weak coupling theories, which are BCS based. Surprisingly, our results agree with both paradigms. The implications of these findings and the missing calculations needed to distinguish between the two paradigms are discussed.
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