Superconductivity in Ni substituted Bi2Ca1Sr2Cu2-xNixOy

Kulkarni, Pramada ; Kulkarni, S. K. ; Nigavekar, A. S. ; Agarwal, S. K. ; Awana, V. P. S. ; Narlikar, A. V. (1990) Superconductivity in Ni substituted Bi2Ca1Sr2Cu2-xNixOy Physica C: Superconductivity and its Applications, 166 (5-6). pp. 530-534. ISSN 0921-4534

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The effect of partial substitution of Ni in place of Cu in Bi2Ca1Sr2NixCu2-xOy has been systematically investigated for 0≤x≤0.2. The XRD of the samples confirms them to be of single phase. The superconducting critical temperature Tc monotonically decreases with Ni concentration; the rate of Tc decrease is around 2.5 K/% of the nominal substitution. All the samples have been subjected to XPS studies. The results show that Ni is incorporated in the lattice in the divalent state with Ni-O bonds substituting for the Cu-O bonds while keeping Bi-O, Sr-O and Ca-O bonds intact. Change in the Ni content does not seem to affect the valence state of Cu. The question of Tc decrease with Ni substitution is examined.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:17933
Deposited On:17 Nov 2010 13:29
Last Modified:04 Jun 2011 09:07

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