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A systematic study of the structural and superconducting behavior of the high Tc compounds YBa_1Cu_(1.9)M_(0.1)O_(7-y) has been performed where M=Ti, V, Mn, Fe, Co, Ni, Zn, Zr, Nb, Mo, In and Sn. Structural analysis shows that most replacements somewhat modify the YBa_2Cu_3O_(7-y) lattice parameters in the orthorhombic structure, with the exception of Fe and Co which transit into tetragonal phase. Although the 1D Cu-O chains are destroyed, the depressed Tc remain within 73 to 76K in the case of Fe and Co. However. the substitution of Ni and Zn on the Cu_2 sites appears to strongly decrease Tc whereas their structure remains orthorhombic. This indicates that the 2D Cu-O planes play a very important role in the transportation of superconducting electrons but the 1D Cu-O chains play a role not only in supplying carrier number but also in coupling the Cu-O planes.
A systematic study of the structural and superconducting behavior of the high Tc compounds YBa_1Cu_ (1.9) M_ (0.1) O_ (7-y) has been performed where M = Ti, V, Mn, Fe, Co, Ni, Zn, Zr, Nb, Mo, In and Sn. Structural analysis shows that most replacements somewhat modify the YBa_2Cu_3O_ (7-y) lattice parameters in the orthorhombic structure, with the exception of Fe and Co which transit into tetragonal phase. Although the 1D Cu- are destroyed, the depressed Tc remain within 73 to 76K in the case of Fe and Co. However, the substitution of Ni and Zn on the Cu_2 sites appears to strongly decrease Tc whereas their structure remains orthorhombic. This indicates that the 2D Cu-O planes play a very important role in the transportation of superconducting electrons but the 1D Cu-O chains play a role not only in supplying carrier number but also in coupling the Cu-O planes.