Abstract
The value of the critical temperature of the cuprates correlates with the doping level and is affected by the interplay of two competing factors: (1) the increase in carrier concentration, and (2) the pair-breaking effect of magnetic impurities. An analysis of the temperature dependence of the critical field leads to the conclusion that magnetic impurities are present even in a sample with the maximum observed value of T{sub c}. A new parameter, {open_quotes}intrinsic{close_quotes} T{sub c} (T{sub c intr}), which is its value in the absence of magnetic impurities, is introduced. The maximum value of T{sub c intr}, which corresponds to the maximum doping level, appears to be similar for different cuprates and to be equal to 160-170 K. This is the upper limit of T{sub c} in the cuprates.
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