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Alkaline Earth (Ca) and Transition Metal (Ni) Doping on The Transport Properties Of Y1-Xcaxba2(Cu1-Yniy)3O7-δ Superconductors

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DOI: 10.4236/jmp.2011.28109    3,567 Downloads   7,535 Views   Citations

ABSTRACT

We report the results of dc resistivity, ac susceptibility, and thermopower study of partial substitution at Y (A site by Ca) and at Cu (B site by Ni) polycrystalline superconductors. The iodometric analysis reveals that the oxygen deficiency,δ,for YBa2Cu3O7-δ(S-I),Y0.9Ca0.1 Ba2Cu3O7-δ(S-II),Y0.8Ca0.2Ba2Cu3O7-δ(S-III) and Y0.9Ca0.1 Ba2(Cu0.99Ni0.01)3O7-δ(S-IV) samples are 0.16, 0.30, 0.39 and 0.29 respectively. The x-ray powder diffraction pattern indicates that all samples are in orthorhombic phase. The dc resistivity, ac susceptiblity and the thermopower measurements shows that the divalent Calcium doping at the trivalent Y site and transition metal Ni doping at Cu site causes a suppression of the superconducting transition temperature (Tc) from 89 to 81 K. The ac susceptibility confirms the ferromagnetic to antiferromagnetic phases at a defined Tc. The room temperature S value increases for Ca substituted YBa2Cu3O7-δwhile to that it decreases for Y0.9Ca0.1Ba2(Cu0.99Ni0.01)3O6.71. The above feature is an indicative of enhanced number of mobile holes for the Ca doped YBa2Cu3O7-δ, while to that the charge carrier density is reduced in simultaneous A (Ca) and B (Ni) site doped sample.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

D. Varshney, A. Yogi, N. Dodiya and I. Mansuri, "Alkaline Earth (Ca) and Transition Metal (Ni) Doping on The Transport Properties Of Y1-Xcaxba2(Cu1-Yniy)3O7-δ Superconductors," Journal of Modern Physics, Vol. 2 No. 8, 2011, pp. 922-927. doi: 10.4236/jmp.2011.28109.

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