Superconductivity in Bi-Ca-Y-Sr-Cu-O (2122) and Tl-Ca-Y-Ba-Cu-O (1122) systems: Effect of substitution of Ca by Y+

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Title:	Superconductivity in Bi-Ca-Y-Sr-Cu-O (2122) and Tl-Ca-Y-Ba-Cu-O (1122) systems: Effect of substitution of Ca by Y+
Authors:	Ganguli, A K Nagarajan, R Nanjundaswamy, K S Rao, C N R
Keywords:	bismuth thallium calcium strontium barium yttrium copper oxides superconductors
Issue Date:	Jan-1989
Publisher:	Pergamon-Elsevier Science Ltd
Citation:	Materials Research Bulletin 24(1), 103-109 (1989)
Abstract:	Effect of substitution of Ca by Y on the properties of TlCaBa2Cu2O7 (1122) and Bi2CaSr2Cu2O8+δ (2122) has been studied. Lattice parameters vary progressively with increase in Y concentration in both the systems. In TlCa1−xYxBa2Cu2O7+δ, compositions with x ≤ 0.5 are superconducting. In Bi2Ca1−xYxSr2Cu2O8+δ, compositions with x <0.5 are superconducting; oxides of both these systems become semiconducting for higher values of x. In Bi-(Ca, Y, Sr)3 Cu2O8+δ, Tc decreases with the increasing Y/Ca ratio becoming zero at a finite value of the ratio. bismuth; thallium; calcium; strontium; barium; yttrium; copper; oxides; superconductors
Description:	Restricted Access
URI:	https://libjncir.jncasr.ac.in/xmlui/10572/1247
Other Identifiers:	0025-5408
Appears in Collections:	Research Papers (Prof. C.N.R. Rao)

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