Correlation between superconducting critical temperature and normal-state resistivity parameters from the codoped ErBa<SUB>2</SUB>Cu<SUB>3&#8722;x&#8722;y</SUB>Zn<SUB>x</SUB>Fe<SUB>y</SUB>O<SUB>7&#8722;&#948;</SUB> system

The Zn and Fe codoped ErBa2Cu3&#8722;x&#8722;yZnxFeyO7&#8722;&#948; system for 0&#60;~x&#60;~0.45, 0&#60;~y&lt;~0.18, and 0.02&#60;~d&#60;~0.21 has been investigated. Superconducting critical temperature Tc, residual resistivity &#961;0, resistivity slope corresponding to the linear &#961;-T region (d&#961;/dT)cc, and a characteristic temperature where &#961;-T goes through a minima Tmin are extracted from resistivity measurements. Interestingly, Zn and Fe in general are found to interfere with each other in determining the values of Tc, &#961;0, (d&#961;/dT)cc, and Tmin. In one particular case of cosubstitution, Tc is found to enhance. Tc correlates with Tmin, &#961;0, and (d&#961;/dT)cc such that an increase in the former two parameters tends to degrade Tc, while an increase in the latter tends to enhance it. These observations suggest that pinning of the dynamically fluctuating striped phase due to Zn and Fe is a reasonable source of Tc suppression in the present system. We further discuss the reasons and possible consequences of the unusual interference effects of Zn and Fe