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Keyword: Orthorhombicity (1)	2 Apr 2025	Run
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articleNo Access
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,
- P. Winotai,
- R. Suryanarayanan, and
- I. M. Tang
International Journal of Modern Physics B20 May 2003
Preview 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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