Effect of replacement of the cu vital environmant for la on the transport properties of YBa2(Cu x-1 Lax)‎3O-7 δ

الملخص EN

To be able to produce high quality superconducting material, the effect of substitution of copper in YBa2(Cu1-x Lax)3O7-s superconductor by La content ( x=0 - 0.06 ) have to be understood .

The study of transport properties of YBa2(Cu1-x Lax)3 O7-s in this work using temperature measurements indicated that the best superconducting properties can be obtained for substitution of Cu by La concentration within the range (x=0.02-0.04).

The highest Tc («90K), sharpest transition to superconductivity (A=5 K) and lowest electrical resistivity (p= 9.2^Q.cm) are corresponding to the substitution samples of x=0.02 and 0.04.

Depression and degradation of the superconducting state as (x) increases above this rang is observed.

Excess dopant of La (x < 0.06) results in a strong decoupling of chains and planes whereas optimal La doping (0.02 < x < 0.04) can be adopted an alternate route to extensive oxygen anneal.