Volume dependence of the superconducting transition temperature for the high-temperature superconductor HgBa2Ca2−xPbxCu3O8+δ
Charles C. Kim, A. R. Drews, E. F. Skelton, S. B. Qadri, M. S. Osofsky, M. E. Reeves, D. H. Liebenberg
DOI 10.1103/PhysRevB.50.13778 · Physical Review B
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Abstract
The homologous series HgBa2Can−1CunO2n+2+δ (n=1,2,3,4) is the newest and most promising of the layered high-Tc superconducting materials, as demonstrated in setting the highest Tc among the known superconducting materials. We slightly doped HgBa2Ca2Cu3O8+δ with Pb, producing HgBa2Ca2−xPbxCu3O8+δ with Tc about 133 K. The Pb dopant helped material growth and still kept Tc close to that of the optimally doped HgBa2Ca2Cu3O8+δ. The superconducting transition temperature as a function of pressure, Tc(P), was measured to 3 GPa. Tc increases monotonicaly with dTc(P)/dP≊1.5 K/GPa near ambient pressure. The lattice parameters as a function of pressure were measured to 5 GPa. The volume decreases monotonically and is represented by an isothermal bulk modulus of BV=143±15 GPa. Both results were combined to produce Tc(V), which is readily comparable to theoretical models.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2-xPbxCu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure unresolved | onset |
| HgBa2Ca2-xPbxCu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 130 | Pressure unresolved | zero_resistance |
| HgBa2Ca2-xPbxCu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 130 | Pressure unresolved | 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. | 127 | Pressure not reported | unknown |
| 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 |
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