Abstract In the framework of the weak coupling theory of superconductivity, we have proved that spin and charge fluctuations in the high-Tc superconductors can pro-duce respectively, pair-breaking and pair-forming effects on the superconductivity resulting from the "generalized BCS mechanism". With the coupling constant for spin fluctuations larger than that for charge fluctuations, they combine to produce a temperature-dependent effective pair-breaking effect, which makes Tc decrease more rapidly than $\Delta$(0), the superconducting gap at T=0, and therefore, enhances the ratio 2$\Delta$(0)/Tc. This provides a reasonable physical interpretation for the relevant experimental results.
Received: 22 July 1993
Accepted manuscript online:
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