Superconductivity of the oxycarbonate Tl0.5Pb0.5Sr4Cu2CO3O7: A magnetic study
S. Peluau, A. Maignan, Ch. Simon, A. Wahl
DOI 10.1103/PhysRevB.50.4125 · Physical Review B
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Abstract
The magnetic behavior of the 71-K superconductor Tl0.5Pb0.5Sr4Cu2CO3O7, which consists of an intergrowth of the two nonsuperconducting phases Sr2CuO2CO3 and Tl0.5Pb0.5Sr2CuO5, has been studied. Its pinning properties in terms of the critical current density Jc and the irreversibility line have been established using a modified-Bean-model expression for the magnetization data and compared to results for other thallium cuprates. Typical Jc was calculated to be ∼8×106 A/cm2 at 5 K in a field of 0.2 T. The analysis of the reversible magnetization, leading to basic values of the parameters for this oxycarbonate as λab(0)=170 nm, ξab(0)=2.39 nm and κ=72.5, was also performed. The latter values are compared to other existing data especially those concerning the thallium-based superconductors which have been derived from similar analyses. This study shows that the superconducting behavior of this oxycarbonate is closer to multiple copper layered cuprates than to the single copper layer ‘‘1201’’ phase although carbonate groups connect two successive copper layers. It can be considered as intermediate between the thallium bilayer cuprates and the best lead-doped ‘‘1223’’ and ‘‘1212’’ superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl0.5Pb0.5Sr4Cu2CO3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure not reported | unknown |
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