Superconductivity and hole doping in Pr0.5Ca0.5Ba2Cu3O7−δ thin films
David P. Norton, D. H. Lowndes, B. C. Sales, J. D. Budai, B. C. Chakoumakos, H. R. Kerchner
DOI 10.1103/PhysRevLett.66.1537 · Physical Review Letters
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Abstract
We have grown superconducting Pr0.5Ca0.5Ba2Cu3O7−δ epitaxial thin films that exhibit a superconducting onset temperature of 43 K with Tc(R=0)=34.9 K. This is the first time, to our knowledge, that 1:2:3-phase superconductivity has been achieved by substituting Ca for Pr, without the presence in the alloy of Υ or any other rare-earth element R for which RBa2Cu3O7−δ is superconducting. This result supports the view that hole localization/filling contributes substantially to the suppression of superconductivity by Pr in PrBa2Cu3O7−δ, and clearly demonstrates that this suppression can be compensated by appropriate hole doping with Ca.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr0.5Ca0.5Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | onset |
| Pr0.5Ca0.5Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.9 | Pressure not reported | zero_resistance |
| Pr0.5Ca0.5Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40.2 | Pressure not reported | midpoint |
| Pr0.5Ca0.5Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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