IMPACT OF Zn SUBSTITUTION ON PHASE FORMATION AND SUPERCONDUCTIVITY OF Bi1.6Pb0.4Sr2Ca2Cu3-xZnxO10-δ WITH x = 0.0, 0.015, 0.03, 0.06, 0.09 AND 0.12

Authors

Rashmi NigamFollow

RIS ID

41591

Publication Details

Nigam, R. (2005). IMPACT OF Zn SUBSTITUTION ON PHASE FORMATION AND SUPERCONDUCTIVITY OF Bi_1.6Pb_0.4Sr₂Ca₂Cu_3-xZn_xO_10-δ WITH x = 0.0, 0.015, 0.03, 0.06, 0.09 AND 0.12, Modern Physics Letters B, 19 (16), 771-778.

Abstract

Samples of series Bi_1.6Pb_0.4Sr₂Ca₂Cu_3-xZn_xO_10-δ with x = 0.0, 0.015, 0.03, 0.06, 0.09 and 0.12 are synthesized by solid-state reaction route. All the samples crystallize in tetragonal structure with majority (> 90%) of Bi-2223(Bi₂Sr₂Ca₂Cu₃O₁₀) phase (c-lattice parameter ~ 36 Å). The proportion of Bi-2223 phase decreases slightly with an increase in x. The lattice parameters a and c of main phase (Bi-2223) do not change significantly with increasing x. Superconducting critical transition temperature (T_c) decreases with x as evidenced by both resistivity [ρ(T)] and ac magnetic susceptibility [χ(T)] measurements. Interestingly the decrement of T_c is not monotonic and the same saturates at around 96 K for x > 0.06. In fact T_c decreases fast (~ 10 K/at%) for x = 0.015 and 0.03 samples and later nearly saturates for higher x values. Present results of Zn doping in Bi-2223 system are compared with other Zn-doped HTSC (high temperature superconducting) systems, namely the RE-123 (REBa₂Cu₃O₇) and La-214 ((La, Sr)₂CuO₄).