Changes in doping state of (Tl, Pb)Sr1212 superconductors with Yb substitution at Sr site

Yahya, Ahmad Kamal and Abdullah, W.F. and Hamadneh, Imad and Jumali, Mohammad Hafizuddin (2007) Changes in doping state of (Tl, Pb)Sr1212 superconductors with Yb substitution at Sr site. Physica C: Superconductivity, 463-465 . pp. 474-477. ISSN 0921-4534

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Official URL: http://dx.doi.org/10.1016/j.physc.2007.05.043

Abstract

Samples with nominal starting compositions of Tl0.5Pb0.5Sr2−yYbyCaCu2O7 (y = 0–0.6) were synthesized using conventional solid-state synthesis method. Temperature dependent electrical resistance measurements on the series showed that the normal state behavior and superconducting properties can be controlled by adjusting Yb concentration to achieve maximum critical temperature (Tc). The best superconducting behavior for the series was observed for Tl0.5Pb0.5Sr1.8Yb0.2CaCu2O7 with onset critical temperature (Tc onset) of 105 K. Results of critical temperature (Tc) measurements, microstructure investigation using scanning electron microscope (SEM) and powder X-ray diffraction (XRD) analysis are presented. The effects of Yb substitutions are discussed in terms of Tc, Tl1212 phase formation and the concept of average Cu valence.

Item Type:Article
Keyword:Substitution effects, TlSr1212, Transition temperature
Subject:Superconductors
Faculty or Institute:Faculty of Environmental Studies
Publisher:Elsevier
DOI Number:10.1016/j.physc.2007.05.043
ID Code:9415
Deposited By: Erni Suraya Abdul Aziz
Deposited On:31 Jan 2011 10:10
Last Modified:31 Jan 2011 10:16

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