Influence of simultaneous doping of Tl and Bi on microstructure and critical current density of HgBa2Ca2Cu3O8+δ by Rajiv Giri, G. D. Verma, R. S. Tiwari, and O. N. Srivastava

Crystal Research and Technology

Cryst. Res. Technol. 38, 760 (2003) - Abstract -

Influence of simultaneous doping of Tl and Bi on microstructure and critical current density of HgBa₂Ca₂Cu₃O_8+δ

Rajiv Giri, G. D. Verma*, R. S. Tiwari, and O. N. Srivastava

Department of Physics, Banaras Hindu University, Varanasi 221005, India
*Department of Physics, I.I.T. Roorkee, Roorkee 247667, India

Keywords	long period polytypoid (LPP), defect substructure, intragrain critical current density
PACS	72.15.-v
DOI	10.1002/crat.200310092

It has been found that simultaneous doping of Tl and Bi at Hg site of HgBa₂Ca₂Cu₃O_8+δ HTSC phase induces interesting microstructural variants in the form of long period polytypoid (LPP) like structure embodying native defect substructures. It has been observed that the as synthesized (HgTl_0.2-xBi_x)Ba₂Ca₂Cu₃O_8+δ (with x=0.05, 0.10, 0.15) phases have superconducting onset transition temperature (T_c) of about ~133K. However, the intragrain critical current density (J_c) for the various materials with different compositions varies significantly. It varies from 6.2x10⁶ A/cm² to 2.9x10⁶ A/cm² at 5K and 1T for (HgTl_0.10Bi₁₀)Ba₂Ca₂Cu₃O_8+δ and (HgTl_0.15Bi_0.05)Ba₂Ca₂Cu₃O_8+δ HTSC phase respectively. A correlation between the intragrain Jc and the defect substructures has been found to be present. This correlation has been described and disscussed.

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