Abstract
Strong signatures of Mg substitution in YBa{sub 2}(Cu{sub 1{minus}x}Mg{sub x}){sub 3}O{sub 7{minus}{delta}} have been obtained from single domain samples prepared by top seeding using YBa{sub 2}Cu{sub 3}O{sub 7(US){delta}} + 30%wt Y{sub 2}BaCuO{sub 5} + X%wt MgO mixtures. A drastic decrease of the superconducting transition temperature with increasing X has been obtained reaching values of {Tc} {approximately}40 K for X=16.7. The {Tc}(x) dependence and thermogravimetric results suggest that Mg atoms substitute Cu(2) sites and that a solubility limit exists. Angular dependent magnetoresistance measurements have been used to determine the anisotropy of YBa{sub 2}(Cu{sub 1{minus}x}Mg{sub x}){sub 3}O{sub 7{minus}{delta}} samples. These results are discussed on the basis of the recent controversy results reported for Zn-doped samples.
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