Citation: Jian MENG, Yu Fang REN. STUDY ON THE nd^a METAL REPLACED YBa₂Cu_3-XM_XO_7-Y[J]. Chinese Chemical Letters, ;1992, 3(2): 141-144. shu

STUDY ON THE nd^a METAL REPLACED YBa₂Cu_3-XM_XO_7-Y

Jian MENG ,
Yu Fang REN

Changchun Institute of Applied Chemistry, Academia Sinica, Changchun, 130022

Received Date: 26 September 1991

A systematic study of the structural and superconducting behavior of the high Tc compounds YBa₁Cu_1.9M_0.1O_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 YBa₂Cu₃O_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 Cu₂ 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.
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