Suppression of superconductivity in Gd1−xPrxBa2Cu3O7−y and R0.8Pr0.2Ba2Cu3O7−y systems
H. D. Yang, P. F. Chen, C. R. Hsu, C. W. Lee, C. L. Li, C. C. Peng
DOI 10.1103/PhysRevB.43.10568 · Physical Review B
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Abstract
The superconductive and magnetic properties of compounds in Gd1−xPrxBa2Cu3O7−y (0≤x≤1.0) and R0.8Pr0.2Ba2Cu3O7−y (R=Y and rare-earth elements) have been investigated by means of x-ray-diffraction, electrical-resistivity, and magnetic-susceptibility measurements. No obvious discrepancies were found between Gd1−xPrxBa2Cu3O7−y and Y1−xPrxBa2Cu3O7−y from the structural and magnetic analysis. The depression of Tc by the Pr concentration can be described by the Abrikosov and Gor’kov pair-breaking-like relation, while the critical concentration xcr is considerably lower in Gd1−xPrxBa2Cu3O7−y than in Y1−xPrxBa2Cu3O7−y. In the R0.8Pr0.2Ba2Cu3O7−y system, the ΔTc [ΔTc=Tc(RBa2Cu3O7−y)-Tc (R0.8Pr0.2Ba2Cu3O7−y)] strongly depends on the ionic radius of rare-earth elements. This suggests that the hybridization between Pr 4f states and conduction bands may play an important role in the quenching of superconductivity in the PrBa2Cu3O7−y system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | unknown |
| Gd0.9Pr0.1Ba2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73.5 | Pressure not reported | unknown |
| Gd0.8Pr0.2Ba2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58 | Pressure not reported | unknown |
| Gd0.7Pr0.3Ba2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| Gd0.65Pr0.35Ba2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure not reported | unknown |
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