Superconductivity above 130 K in the Hg-Pb-Ba-Ca-Cu-O system
Z. Iqbal, T. Datta, D. Kirven, A. Lungu, J. C. Barry, F. J. Owens, A. G. Rinzler, D. Yang, F. Reidinger
DOI 10.1103/PhysRevB.49.12322 · Physical Review B
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Abstract
High volume fractions of the n=2 and n=3 members of a cuprate system of general formula Hg1−xPbxBa2Can−1CunO2n−2+δ (with an average value of x at 0.33) have been synthesized via a relatively facile process using low oxygen pressures. For as-synthesized n=3 (Hg,Pb-1:2:2:3) bulk superconducting critical temperatures (Tc) of up to 133 K have been observed. For n=2 (Hg,Pb-1:2:1:2), which is obtained with some rare-earth-ion substitution at the calcium site, Tc is 125 K after annealing in a reducing atmosphere. High-resolution lattice imaging coupled with structural simulations show that the Pb ions go into the Hg layer, leading to a chemical pressure-induced compositional modulation in this plane. Strong flux pinning and an irreversibility field of 1 T at 80 K are observed for Hg,Pb-1:2:2:3.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg0.67Pb0.33Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure not reported | onset |
| Hg0.67Pb0.33Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 130 | Pressure not reported | zero_resistance |
| Hg0.67Pb0.33Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 140 | Pressure not reported | onset |
| (Hg,Pb)Ba2(Ca,Y)Cu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 125 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure not reported | unknown |
| 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 |
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