Distinguishable effects of oxygen and rhenium in HgBa2CuO4+δ superconductors
L. Fàbrega, J. Fontcuberta, A. Serquis, A. Caneiro
DOI 10.1103/PhysRevB.62.4148 · Physical Review B
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Abstract
Muon spin relaxation and magnetization experiments on Hg1−xRexBa2CuO4+δ ceramics with different oxygen and Re contents allow us to discern the effects of the incorporation of both elements in this superconductor. For all compositions, Tc and σ∼λ−2 are strongly dependent on δ and display a maximum at optimal doping. The optimal Tc and σ values are nearly independent of x, thus indicating that the Re substitution has only second order effects on the basic superconducting properties of this compound, near optimal doping. Samples with Re have higher oxygen contents, due to the high valence of this cation. However, the shift of the Tc(δ) and σ(δ) curves toward higher δ values as x increases suggests that the oxygen atoms coordinating the Re cations are less effective to doping than the excess oxygen atoms present in Re-free samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | onset |
| Hg1-xRexBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure not reported | unknown |
| Hg0.82Re0.18Sr2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Hg0.82Re0.18Ba2Ca2Cu3O8 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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