Abstract
We have achieved the preparation of the Y(Ba1−xSrx)2Cu3O7 compounds with x ranging from 0 to 1 by substituting small amount of Cu by Mo. It was observed that the superconducting transition temperature, Tc, first decreases linearly with Sr-content until x>0.4 where a sharp drop in Tc occurs. X-ray structure analysis shows that a sharp drop in Tc at a critical concentration corresponds to the crystal change from orthorhombic to tetragonal.
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