Abstract
We have examined the suppression of T c in Tl-2212 system by substituting Co impurity at its Cu site and have discussed the results using unitary pair-breaking formalism due to Abrikosov and Gorkov. It is found that the suppression of the superconducting transition temperature T c is more rapid in the underdoped region. Values of the pseudogap magnitude ( E g) at each Co doping are thereby estimated within a “Fermi-level density of states suppression” picture. The estimated pseudogap magnitude is observed to have a correspondence with a related characteristic temperature T * obtained from thermopower measurements. Both T * and E g are found to follow an inverse power law with hole concentration (∼1/ p n ) for different n values. Similar inverse power law dependence of the superconducting energy gap has also been observed in Bi-2212 and La-214 system [Oda et al. Supercond. Sci. Technol. 13 (2000) R139].
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