Structure and superconductivity of HgBa2Ca2Cu3O8+δ
J. L. Wagner, B. A. Hunter, D. G. Hinks, J. D. Jorgensen
DOI 10.1103/PhysRevB.51.15407 · Physical Review B
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Abstract
We have investigated the structure, defect concentration, and superconducting properties of HgBa2Ca2Cu3O8+δ by neutron powder diffraction, thermogravimetric analysis, and ac susceptibility. Samples with three oxygen contents and Tc’s ranging from 135 to 94 K, obtained through different annealing conditions, were studied. Two defect sites were observed in all samples. The concentration of defect oxygen atoms located at a site in the center of the Hg-Oδ plane, is found to vary from 0.18(2) to 0.10(2) oxygen atoms per formula unit as Tc decreases from 135 to 94 K. An additional defect, which we interpret as oxygen atoms associated with the substitution of Cu on the Hg site, is found to have a fixed concentration of ∼0.09(2) oxygen atoms per formula unit.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 135 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | unknown |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure not reported | unknown |
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