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Structural and Superconducting Properties of RE_{1 - 2x}Pr_xCa_xSr_0.8Ba_1.2Cu₃O_{7 - δ} (RE = Er and Gd) High T_c Superconductors

N. Charoenthai

Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand

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P. Winotai

Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand

Institute of Science and Technology Development, Mahidol University Salaya, Nakorn Pathom 73170, Thailand

Corresponding author.

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R. Suryanarayanan

Laboratoire de Physico-Chimie de l'Etat Solide, Bât. 410, Université Paris-Sud, 91405 Orsay, France

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, and

I. M. Tang

Department of Physics, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand

Institute of Science and Technology Development, Mahidol University Salaya, Nakorn Pathom 73170, Thailand

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https://doi.org/10.1142/S0217979203018466Cited by:2 (Source: Crossref)

Abstract

We report here on the structural and superconducting properties of RE_{1 - 2x}Pr_xCa_xSr_0.8Ba_1.2Cu₃O_{7 - δ} (RE = Er and Gd, 0 ≤ x ≤ 0.2) high temperature superconductors. The transition temperature (T_c) of these compounds decreases when the Pr and Ca concentrations are increased. At constant Pr and Ca concentrations, the T_c of Er_{1 - 2x}Pr_xCa_xSr_0.8Ba_1.2Cu₃O_{7 - δ} superconductor system is higher than that observed for the Gd_{1 - 2x}Pr_xCa_xSr_0.8Ba_1.2Cu₃O_{7 - δ} system. For the Gd_0.8Pr_0.1Ca_0.1Sr_0.8Ba_1.2Cu₃O_{7 - δ} sample, after heating in argon followed by oxygen annealing, the orthorhombicity increases accompanied by 10 K increase in T_c. These results show that though our data indicate an ion-size effect, the T_c suppression rate dT_c/dx depends very much on the heat treatment adopted to prepare the samples.

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