Effect of la substitution on the structure and superconductivity of YBa2 (Cu1- x Lax)‎3 O7-ᵹ superconductor (0 ≤ x ≤ 0.06 )‎

الملخص EN

In this research, samples were prepared by using solid state reaction with starting composition YBa2 (Cu1- x Lax)3 O7-ᵹ for x=0.0 , 0.02 .

0.04 and 0.06 .

The variation of the structural changes of the lattice parameters (a, b and c / 3) , orthorhombic distortion and strain of YBa2 (Cu1- x Lax)3 O7-ᵹ prepared samples as a function of La concentration (x) within the range of (0 < x ≤ 0.06) were studied, using XRD measurements.

Within this range, all samples showed orthorhombic phase and no phase transition to the tetragonal is observed.

An increase of a-parameter is shown due to the substiution of Cu by La which has larger ionic radius.

While b-parameter, c / 3 parameter, orthorhombic distortion and strain showed similar behavior to eachother.

All of them decreased to a minimum value at x=0.02, then followed by a successive increase up to x=0.06.