Transport properties of the oxides Y1−xPrxBa2Cu3O7−δ (0≤x≤1): Effects of band filling and lattice distortion on superconductivity
A. P. Gonçalves, I. C. Santos, E. B. Lopes, R. T. Henriques, M. Almeida, M. O. Figueiredo
DOI 10.1103/PhysRevB.37.7476 · Physical Review B
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Abstract
The oxides with composition Y1−xPrxBa2(Cu3O7−δ)(0≤x≤1) 7-δ (0≤x≤1) are characterized by x-ray diffraction, resistivity (ρ) and thermoelectric power (S) measurements. X-ray diffraction shows an orthorhombically distorted perovskite structure for all compositions, the pseudotetragonality increasing with x. The substitution of the tetravalent Pr for the trivalent Y atom increases the band filling in these materials. As a consequence, the superconducting transition temperature is progressively decreased with increasing x, and S significantly increases. Thermopower and resistivity measurements indicate that these oxides have relatively narrow bands and that the electronic correlations dominate their properties.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.6 | Pressure unresolved | midpoint |
| Y0.95Pr0.05Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | midpoint |
| Y0.9Pr0.1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.6 | Pressure unresolved | midpoint |
| Y0.8Pr0.2Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76.4 | Pressure unresolved | midpoint |
| Y0.7Pr0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60.5 | Pressure unresolved | midpoint |
| Y0.6Pr0.4Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure unresolved | midpoint |
| Y0.5Pr0.5Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.7 | Pressure unresolved | midpoint |
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