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Strong signatures of Mg substitution in Yba2(Cu1−xMgx)3O7−δhave been obtained from single domain samples prepared by top seeding using YBa2Cu3O7−δ + 30%wt Y2BaCuO5 +X%wt MgO mixtures. A drastic decrease of the superconducting transition temperature with increasing X has been obtained reaching values of Tc∼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 magne-toresistance measurements have been used to determine the anisotropy of YBa...
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