The concentration dependence of the transition temperature Tc has been studied in the high-Tc compounds (Y1-xTlx)Ba2Cu3O7-y, Y(Ba1-xKx)2Cu3O7-y and YBa2(Cu1-xMgx)3O7-y. In the TI-compound, the results show littl e effect on Tc. In the K-compound, Tc gradually drops with increasing K concentration. In the Mg-compound, Tc abruptly drops with increasing Mg concentration.
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